In the world of adjectives, there is a myriad of possibilities to describe and enhance the meaning of the nouns they accompany. Among these adjectives, some stand out for their length and complexity, adding a touch of sophistication and depth to your writing.
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In this handy resource, we present an extensive list of 15-letter adjectives that will not only enrich your vocabulary but also elevate the quality of your prose.
Adjectives With 15 Letters Starting With A
absorptiometric
accommodational
acculturational
achlorophyllous
achondroplastic
acknowledgeable
allotriomorphic
amaryllidaceous
amphiarthrodial
amphitheatrical
andromonoecious
animadversional
antepenultimate
anteprohibition
anthropocentric
anthropogenetic
anthropographic
anthropological
anthropomorphic
anthroponomical
antiatheistical
anticeremonious
anticoagulating
anticommunistic
anticommutative
antieducational
antiegotistical
antievolutional
antifeudalistic
antigrammatical
antigravitation
antilogarithmic
antimachination
antimechanistic
antiministerial
antimodernistic
antimonarchical
antioxygenating
antiparasitical
antipatriarchal
antiperistaltic
antiphilosophic
antipragmatical
antiprogressive
antirationalist
antirestoration
antiritualistic
antisensitizing
antisymmetrical
antisyndication
antitheological
antitraditional
antituberculous
antivaccination
asclepiadaceous
atherosclerotic
autosuggestible
Adjectives With 15 Letters Starting With B
bacteriological
basidiomycetous
bibliographical
bibliophilistic
biogeographical
brachydactylous
brachystomatous
branchiostegous
Adjectives With 15 Letters Starting With C
caprifoliaceous
carpometacarpal
caterpillarlike
centrosymmetric
cephalothoracic
cerebrovascular
cerebrovisceral
chalcographical
characterisable
characterizable
chartographical
chenopodiaceous
chesterfieldian
chorioallantoic
chromatographic
chronogrammatic
churrigueresque
cinematographic
circumferential
circumnavigable
circumscribable
circumscriptive
cirrocumulative
coinstantaneous
collenchymatous
commemorational
commercialistic
compunctionless
conceptualistic
configurational
contemporaneous
contortionistic
convolvulaceous
corynebacterial
costoclavicular
countermandable
counterrotating
counterweighted
cricopharyngeal
cryptogrammatic
cryptographical
crystalliferous
Adjectives With 15 Letters Starting With D
decontaminative
demonstrational
deuteranomalous
dextrosinistral
dialectological
disadvantageous
displeasureable
disproportional
dissatisfactory
distinctionless
distinguishable
dysteleological
Adjectives With 15 Letters Starting With E
ecclesiological
echinodermatous
electroacoustic
electroanalytic
electrochemical
electrodialitic
electrometrical
electronegative
electrophoretic
electropositive
electrosurgical
enantiomorphous
enchondromatous
endocrinopathic
entrepreneurial
epidemiological
epistemological
epitheliomatous
ethnohistorical
ethnolinguistic
eudaemonistical
excommunicative
excommunicatory
excrementitious
exemplificative
exhibitionistic
experimentative
expressionistic
extracurricular
Adjectives With 15 Letters Starting With F
fertilisational
fertilizational
feuilletonistic
Adjectives With 15 Letters Starting With G
galvanometrical
gastroenteritic
glossographical
glyconeogenetic
gynaecomorphous
gynandromorphic
Adjectives With 15 Letters Starting With H
hallucinational
hamamelidaceous
hemochromatotic
hemocytoblastic
heterochromatic
heterochthonous
heterodactylous
heterographical
histopathologic
historiographic
housekeeperlike
hydrogeological
hydromechanical
hyperaltruistic
hypercarbureted
hypercatalectic
hypercoagulable
hyperdemocratic
hyperdiabolical
hyperfastidious
hyperfunctional
hyperidealistic
hypermetaphoric
hypermiraculous
hyperpathetical
hyperpotassemic
hyperrhythmical
hyperridiculous
hyperscholastic
hyperscrupulous
hypervoluminous
hypocrateriform
hypophosphorous
hystricomorphic
Adjectives With 15 Letters Starting With I
immunogenetical
imperscriptible
imprescriptible
impressionistic
improvisational
inapprehensible
incommunicative
incomprehensive
inconsecutively
inconsequential
indemnificatory
indeterministic
indiscretionary
individualistic
infundibuliform
inscriptionless
interapophyseal
interasteroidal
intercarpellary
interchangeable
interclavicular
intercollegiate
intercomparable
interconciliary
interdependable
interepithelial
interfascicular
interferometric
interfoliaceous
interganglionic
intergenerating
intergenerative
interindividual
interinhibitive
interjaculatory
interlaboratory
interlacustrine
intermammillary
intermandibular
intermeasurable
intermembranous
intermesenteric
intermetacarpal
intermetatarsal
interparliament
interparoxysmal
interpeduncular
interpenetrable
interphalangeal
interprovincial
interregimental
interrogational
interscholastic
intersubjective
intersystematic
intertentacular
intertrabecular
intertubercular
interuniversity
introspectional
intussusceptive
investigational
irrationalistic
isobathythermal
isobathythermic
isoperimetrical
isothermobathic
Adjectives With 15 Letters Starting With J
jurisprudential
juxtapositional
Related reading: How To Use Punctuation
Adjectives With 15 Letters Starting With K
kakistocratical
kinematographic
knickerbockered
Adjectives With 15 Letters Starting With L
laryngoscopical
laryngotracheal
lexicographical
lexicostatistic
lignocellulosic
liturgiological
Adjectives With 15 Letters Starting With M
macrolinguistic
menispermaceous
mephistophelean
mesoappendiceal
microanalytical
microbiological
microelectronic
misapprehensive
monogrammatical
multiarticulate
multibranchiate
multichannelled
multicuspidated
multiflagellate
multiganglionic
multigranulated
multinucleolate
multiperforated
multisacculated
multistratified
Adjectives With 15 Letters Starting With N
neuroanatomical
nitrocellulosic
nonabsolutistic
nonaccelerative
nonacceleratory
nonaccommodable
nonaccompanying
nonacculturated
nonaccumulating
nonaccumulative
nonadaptational
nonadjudicative
nonadministrant
nonadvantageous
nonadventitious
nonagricultural
nonalliterative
nonalphabetical
nonanesthetized
nonantagonistic
nonanticipative
nonanticipatory
nonapologetical
nonapparitional
nonappendicular
nonappreciative
nonapprehensive
nonapproachable
nonappropriable
nonaristocratic
nonarithmetical
nonarticulative
nonassimilating
nonassimilative
nonassimilatory
nonastronomical
nonbiographical
nonbureaucratic
noncalumniating
noncapitalistic
noncatastrophic
nonclassifiable
noncleistogamic
noncoincidental
noncommendatory
noncommissioned
noncompensating
noncompensative
noncompensatory
noncompoundable
noncompressible
noncompromising
nonconcentrated
nonconcentrical
nonconciliating
nonconciliatory
nonconfidential
nonconfirmative
nonconfirmatory
noncongregative
nonconsistorial
nonconstraining
nonconstricting
nonconstrictive
nonconstructive
nonconsultative
nonconsultatory
noncontaminable
noncontemptible
noncontemptuous
nonconterminous
noncontributing
noncontributive
noncontributory
noncontrollable
noncontumacious
nonconventional
noncoordinating
noncotyledonary
noncotyledonous
noncrystallized
noncultivatable
nondebilitating
nondebilitative
nondecasyllabic
nondeflationary
nondegenerative
nondeliquescent
nondemocratical
nondemonstrable
nondenunciating
nondenunciative
nondenunciatory
nondepartmental
nondepreciating
nondepreciative
nondepreciatory
nondesulfurized
nondeterminable
nondiagrammatic
nondiphtheritic
nondisappearing
nondisciplinary
nondisciplining
nondiscountable
nondiscoverable
nondisingenuous
nondisputatious
nondistributive
nondomesticated
noneffervescent
nonelectrolytic
noneleemosynary
nonemancipative
nonembellishing
nonencyclopedic
nonenlightening
nonenterprising
nonentertaining
nonenthusiastic
nonepigrammatic
nonepiscopalian
nonequivocating
nonethnological
nonevolutionary
nonexaggerating
nonexaggerative
nonexaggeratory
nonexchangeable
nonexpediential
nonexperiential
nonexperimental
nonexternalized
nonextinguished
nonextraditable
nonfermentative
nongelatinizing
nongenealogical
nongeographical
nongovernmental
nonhallucinated
nonhierarchical
nonhistrionical
nonhyperbolical
nonhypostatical
noniconoclastic
nonilluminating
nonilluminative
nonillustrative
nonimpedimental
nonincandescent
nonincorporated
noninflammatory
noninflationary
noninflectional
noninspissating
noninstrumental
nonintercepting
noninterceptive
nonintermittent
noninterruptive
nonintersecting
nonintoxicating
nonintoxicative
nonintroversive
nonjournalistic
nonlepidopteral
nonloxodromical
nonlugubriously
nonmanipulative
nonmanipulatory
nonmanufactured
nonmarriageable
nonmathematical
nonmelodramatic
nonmetamorphous
nonmetaphorical
nonmetaphysical
nonmeteorologic
nonmodificative
nonmodificatory
nonmonarchistic
nonmonopolistic
nonmotivational
nonmucilaginous
nonmythological
nonnarcissistic
nonnaturalistic
nonnegativistic
nonnitrogenized
nonnominalistic
nonoccupational
nonoligarchical
nonopinionative
nonoptimistical
nonorthographic
nonpacificatory
nonpathological
nonperceptional
nonpestilential
nonpharmaceutic
nonphilological
nonphotographic
nonpositivistic
nonprecedential
nonpreferential
nonprescriptive
nonpreservative
nonpresidential
nonprocessional
nonprofessorial
nonpropitiative
nonproportional
nonproportioned
nonproscriptive
nonprovidential
nonprovisionary
nonpsychopathic
nonquantitative
nonrationalized
nonrecalcitrant
nonrecollective
nonreconcilable
nonrecuperative
nonrecuperatory
nonrefractional
nonregenerating
nonregenerative
nonrelativistic
nonremunerative
nonreproducible
nonreproductive
nonresuscitable
nonsacrilegious
nonsaponifiable
nonschismatical
nonscholastical
nonsecretionary
nonsensualistic
nonsociological
nonspecializing
nonstandardized
nonsubconscious
nonsubstantival
nonsubstitutive
nonsuccessional
nonsupplemental
nonsupplicating
nonsurrealistic
nonsympathizing
nonsynchronical
nonsystematical
nontautological
nonteleological
nontestamentary
nontheocratical
nontheosophical
nontitaniferous
nontotalitarian
nontraditionary
nontranscribing
nontransferable
nontransforming
nontransitional
nontransposable
nonvituperative
nucleoplasmatic
Adjectives With 15 Letters Starting With O
occasionalistic
oceanographical
omnidirectional
ophthalmometric
ophthalmoscopic
opisthognathous
organographical
organomagnesium
orthophosphoric
overaffirmative
overcasuistical
overcircumspect
overcompetitive
overconsiderate
overcontentious
overdeferential
overdescriptive
overdestructive
overdoctrinaire
overfunctioning
overimaginative
overimpressible
overinfluential
overinstructive
overinventoried
overpessimistic
overpresumptive
oversacrificial
oversentimental
overspeculative
overstimulative
oversusceptible
overventuresome
Adjectives With 15 Letters Starting With P
paederastically
palaeobotanical
paleobiological
paleoecological
paleontographic
paleopathologic
paleozoological
parasitological
parasympathetic
particularistic
passifloraceous
pathobiological
pepper-and-salt
perfectionistic
perspectiveless
phantasmagorial
phantasmagorian
pharmacodynamic
pharmacognostic
pharmacological
phenomenalistic
photoconductive
physicochemical
phytogeographic
phytosociologic
plagiocephalous
platyhelminthic
pleuropneumonic
plumbaginaceous
pneumatological
pneumatophorous
polycrystalline
polysyllogistic
polyunsaturated
postapostolical
postcommunicant
postconsonantal
postdiphtherial
postdisapproved
posthemorrhagic
posthippocampal
postincarnation
postpericardial
postprophetical
postsuppurative
preagricultural
prealphabetical
prebroadcasting
precapitalistic
preconceptional
precontributive
predepartmental
prediphtheritic
prediscontented
prediscountable
preevolutionary
preexperimental
preformationary
preinflectional
preintellectual
preirrigational
prejournalistic
prepalaeolithic
presatisfactory
presupplemental
proaristocratic
procompensation
proconciliation
proconfiscation
proconscription
proconservation
proconsultation
procontinuation
procrastinative
procrastinatory
prodistribution
proevolutionary
prointervention
promonopolistic
pronunciational
prosenchymatous
prosubscription
prosubstitution
protozoological
pseudoaesthetic
pseudoamatorial
pseudoancestral
pseudoangelical
pseudoascetical
pseudoassertive
pseudobaptismal
pseudocoelomate
pseudocourteous
pseudodiastolic
pseudoeditorial
pseudoelectoral
pseudoembryonic
pseudoemotional
pseudoepiscopal
pseudoevangelic
pseudogenerical
pseudohexagonal
pseudoidentical
pseudoimpartial
pseudoinspiring
pseudoisometric
pseudolaminated
pseudolegendary
pseudomasculine
pseudoparalytic
pseudoparasitic
pseudopatriotic
pseudopermanent
pseudopolitical
pseudoprimitive
pseudoprophetic
pseudorealistic
pseudoreligious
pseudorheumatic
pseudosatirical
pseudoscholarly
pseudospherical
pseudospiritual
pseudostigmatic
pseudotripteral
pseudozoogloeal
psychotomimetic
psychrometrical
pyrocrystalline
Adjectives With 15 Letters Starting With Q
quadruplication
quadruplicature
Adjectives With 15 Letters Starting With R
radiobiological
radiotelephonic
reconstructible
reduplicatively
resurrectionary
rhinencephalous
roentgenoscopic
round-the-clock
Adjectives With 15 Letters Starting With S
sarraceniaceous
scaphocephalous
schopenhauerian
sclerodermatous
seismographical
selenographical
semiallegorical
semianaesthetic
semianarchistic
semiandrogenous
semiblasphemous
semicaricatural
semiconditioned
semiconvergence
semicrystalline
semicylindrical
semidestructive
semidictatorial
semigeometrical
semiintoxicated
semilegislative
semimanneristic
semimechanistic
semimineralized
semiministerial
semimonarchical
semimountainous
semiphilosophic
semipneumatical
semipopularized
semipsychologic
semireactionary
semirespectable
semisentimental
semisocialistic
semispeculative
semispontaneous
semistimulating
semitheological
semitraditional
servomechanical
sinistrodextral
sinorespiratory
spectrochemical
spectroscopical
staphyloplastic
stereochromatic
stereographical
stratospherical
subarchesporial
subarticulative
subcarbonaceous
subcommendatory
subcommissarial
subcompensative
subcompensatory
subconferential
subconjunctival
subdenticulated
subdepartmental
subincandescent
subinflammatory
subintegumental
subintroductive
subintroductory
submetaphorical
subpedunculated
subpreceptorial
subprefectorial
subprofessional
subproportional
subquadrangular
substitutionary
subtrochanteric
subturriculated
subverticilated
superabominable
superacidulated
superadditional
superartificial
superattainable
superattractive
superbelievable
superbenevolent
supercerebellar
superchivalrous
superclassified
supercoincident
supercommercial
superconducting
superconductive
supercretaceous
supercultivated
superdemocratic
superdiabolical
superelementary
superexcrescent
superexpressive
superfoliaceous
superformidable
superfructified
superfunctional
superhistorical
superimpersonal
superimprobable
supermechanical
superoratorical
superornamental
superprecarious
superprosperous
supersacerdotal
superscandalous
superscientific
superseraphical
supersphenoidal
superstructural
supersublimated
supersubtilized
supersufficient
supersulfureted
supersuspicious
supervictorious
supervoluminous
suppositionless
synchronistical
Adjectives With 15 Letters Starting With T
tetrasyllabical
thalassographic
thermosensitive
transcriptional
transelementary
transequatorial
transindividual
transmeridional
transpenetrable
transperitoneal
transpositional
transsepulchral
transubstantial
trigonometrical
trophoplasmatic
Adjectives With 15 Letters Starting With U
ultrastructural
unaccommodating
unacknowledging
unadministrable
unagglomerative
unanachronistic
unantagonisable
unantagonizable
unapostrophized
unapprehendable
unapprehensible
unarchitectural
unargumentative
unascertainable
unauthenticated
unauthoritative
unchallengeable
uncharacterised
uncharacterized
unchronological
uncircumscribed
uncollaborative
uncombinational
uncommanderlike
uncommemorative
uncommiserating
uncommiserative
uncommunicating
uncommunicative
uncompanionable
uncompassionate
uncomplementary
uncomplimentary
uncomplimenting
uncomprehending
uncomprehensive
unconcatenating
unconcentrative
uncondescending
unconglomerated
unconglutinated
uncongratulated
uncongressional
unconjecturable
unconscientious
unconsentaneous
unconsolidating
unconstrainable
uncontaminative
uncontemplative
uncontradictive
uncontradictory
uncontroversial
uncorresponding
uncorroborative
uncorroboratory
uncounterfeited
uncountermanded
uncountervailed
undemonstrative
underprivileged
underproductive
underproficient
underscrupulous
undeteriorating
undeteriorative
undevelopmental
undisappointing
undischargeable
undisciplinable
undiscreditable
undiscriminated
undisfranchised
undisillusioned
undispassionate
undistinguished
unencounterable
unentertainable
unentomological
unestablishable
uneuphemistical
unexceptionable
unexpostulating
unextraordinary
unforeshortened
unforestallable
unfossiliferous
unfrequentative
ungentlemanlike
ungesticulating
ungesticulative
ungesticulatory
ungravitational
unhallucinating
unhallucinatory
unideographical
unimperialistic
unincriminating
unindoctrinated
uninquisitorial
uninstitutional
uninternational
uninterpolative
uninterpretable
uninterrogative
uninterrogatory
unintrospective
uninvestigating
uninvestigative
uninvestigatory
unknowledgeable
unmanifestative
unmanipulatable
unmaterialistic
unmetallurgical
unmetamorphosed
unmisunderstood
unmorphological
unmultiplicable
unmunicipalised
unmunicipalized
unnationalistic
unnecessitating
unobjectionable
unopportunistic
unpantheistical
unparenthesised
unparenthesized
unparenthetical
unparliamentary
unparticipating
unparticipative
unperpendicular
unpersonalising
unpersonalizing
unphilanthropic
unphilosophical
unphysiological
unplatitudinous
unplutocratical
unporcelainized
unprecipitative
unpreponderated
unprepossessing
unpreternatural
unprevaricating
unprimitivistic
unproblematical
unpronounceable
unproportionate
unpsychological
unrationalising
unrationalizing
unreciprocating
unrecommendable
unrecompensable
unreconnoitered
unreconstructed
unrecriminative
unrehabilitated
unrelinquishing
unremonstrating
unremonstrative
unreprehensible
unrepresentable
unrequisitioned
unresuscitating
unresuscitative
unretrogressive
unreverberating
unreverberative
unrevolutionary
unsacrificeable
unsanctimonious
unschizophrenic
unscintillating
unsectionalised
unsectionalized
unsegregational
unselfconscious
unsignificative
unsophisticated
unspiritualised
unspiritualized
unsportsmanlike
unstatesmanlike
unstentoriously
unstrengthening
unsubordinative
unsubstantiated
unsuperstitious
unsupplementary
unsuppositional
unsyllogistical
unsymptomatical
unsystematising
unsystematizing
untemperamental
unterminational
untherapeutical
untopographical
untranscribable
untransformable
untransmigrated
untransmissible
untransportable
untrigonometric
unyachtsmanlike
Adjectives With 15 Letters Starting With V
ventriloquistic
vicissitudinary
vicissitudinous