Are you looking for a comprehensive list of adjectives that start with the letter O? You’ve come to the right place! This article contains a list of 927 adjectives, all beginning with the letter O and arranged in alphabetical order.
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With this list, you can find the perfect adjective to describe any situation. Examples of adjectives beginning with O include ‘overapprehensive’ (fearful or anxious beyond what is warranted by the situation), ‘obligable’ (obliging or willing to do a favor), ‘overpopular’ (very popular), ‘ostensible’ (appearing to be true or real, but possibly false or misleading) and ‘orphean’ (beautiful and melodious).
The words arranged in the lists below are in alphabetical order, from left to right and down.
List Of 4-Letter Adjectives Starting With “o”
oily
olid
oory
oozy
otic
outr
List Of 5-Letter Adjectives Starting With “o”
oaken
oared
oaten
obese
ohmic
olden
older
oleic
orrow
ortho
osmic
ovate
overt
ovine
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List Of 6-Letter Adjectives Starting With “o”
oafish
obtect
obtuse
ochery
odinic
odious
odylic
offish
oilier
oldest
oleoyl
oniony
oozier
opacus
orangy
ornate
ornery
orphic
oscine
osmous
osteal
otiose
ovular
owlish
oxalic
oxidic
oxlike
ozonic
List Of 7-Letter Adjectives Starting With “o”
oarless
oarlike
oasitic
obconic
obovate
obovoid
obscene
obvious
oceanic
ocellar
oceloid
ocreate
octadic
octaval
odinian
odorful
odorous
oedipal
ogreish
ogygian
oidioid
oiliest
oilless
oillike
olivary
olympic
omental
ominous
omnific
oncotic
oneiric
onerous
ongoing
onymous
oolitic
ooziest
operose
ophitic
opsonic
optical
optimal
opulent
orectic
orotund
orphean
oscular
osiered
osirian
osmious
osseous
osteoid
otalgic
outdoor
outeyed
outmost
ovarian
overage
overapt
overbig
overcoy
overdry
overdue
overfat
overfew
overfit
overhot
overlax
oversad
ovidian
oviform
owllike
oxblood
ozonous
List Of 8-Letter Adjectives Starting With “o”
obdurate
obedient
obeisant
obeyable
oblatory
obligato
obliging
obsolete
obvolute
occlusal
ocherous
ochreous
octantal
odinitic
odontoid
odorless
odourful
oedipean
oenochoe
oestrous
oilfired
oiltight
olefinic
omissive
ommateal
oogamous
oophoric
oophytic
oosporic
operable
operatic
opsonoid
optional
oracular
orchitic
ordurous
orgasmic
orgastic
orgulous
oriental
ornithic
orogenic
orthodox
oscitant
osculant
ossianic
ossified
osteitic
ostiolar
outbound
outdated
outlying
outmoded
ovenlike
overable
overbold
overbusy
overcold
overcool
overdear
overdeep
overeasy
overfast
overflat
overfond
overfoul
overfree
overglad
overhard
overhigh
overhuge
overidle
overkeen
overkind
overlate
overlewd
overloud
overlush
overmany
overmean
overmeek
overmild
overneat
overnice
overrash
overrich
overrife
overrude
overshot
overslow
oversoft
oversour
oversure
overtame
overtart
overthin
overtrue
overwary
overweak
overwide
overwild
overwily
owlishly
oxidable
oxidasic
oxydasic
oxygenic
List Of 9-Letter Adjectives Starting With “o”
obclavate
obconical
obcordate
obcuneate
obeliscal
obligable
oblivious
oblongish
obnoxious
obsequent
observant
obsessive
obstetric
obstinate
obtrusive
obtundent
obumbrant
occludent
occurrent
oceanlike
ocellated
octagonal
octastyle
octennial
oculistic
odourless
offerable
officious
offscreen
oleaceous
omissible
omophagic
onanistic
oncogenic
oncologic
onionlike
onomastic
onondagan
onrushing
ontogenic
oogenetic
ookinetic
oological
openchain
opportune
opposable
oppugnant
opuscular
orbicular
ordinaire
ornithoid
orometric
orphreyed
orthoptic
ossicular
ostensive
otocystic
otoscopic
outdoorsy
outermost
outspoken
ovational
overacute
overangry
overblown
overbrave
overbulky
overcanny
overcheap
overcivil
overclean
overclose
overcured
overeager
overempty
overfaint
overfamed
overfrail
overfrank
overglaze
overgreat
overgross
overhappy
overhardy
overharsh
overhasty
overheady
overheavy
overhuman
overlarge
overloath
overlofty
overloose
overloyal
overmerry
overmoist
overmoral
overnoble
overobese
overplain
overplump
overprone
overproof
overquiet
overready
overrigid
overrough
oversalty
oversaucy
oversexed
overshort
overslack
overstale
overstiff
overstout
oversweet
overtense
overthick
overtight
overtimid
oviferous
oviparous
oxidative
oximetric
Related reading: The Ultimate Guide to Using Verbs: Boost Your Writing Skills!
List Of 10-Letter Adjectives Starting With “o”
obeliskoid
obligatory
obsequious
observable
obvolutive
occamistic
occasional
occupative
occupiable
octahedral
octamerous
octangular
octavalent
oculomotor
odontalgic
offendable
offendible
officeless
oldfangled
oleaginous
oligarchic
oliguretic
olivaceous
olympiadic
ommatidial
omnificent
omniscient
omnivorous
opalescent
openairish
operatable
operculate
ophiologic
ophthalmic
oppressive
optimistic
oratorical
oratorlike
orbiculate
orchestral
ordainable
organismal
organismic
ornamented
orogenetic
orological
orthogenic
orthogonal
orthopedic
orthopneic
orthostyle
osculatory
osmometric
ossiferous
ostensible
osteologic
ostracodan
otherguess
otological
otoplastic
outlandish
outrageous
overactive
overbitter
overblithe
overbright
overbrutal
overcasual
overclever
overcommon
overcostly
overdainty
overfacile
overfamous
overfierce
overflorid
overfluent
overforged
overformed
overfrugal
overgenial
overgentle
overgifted
overgloomy
overgreasy
overgreedy
overground
overguilty
overhatted
overhearty
overhomely
overhonest
overhumane
overhumble
overjoyful
overjoyous
overlavish
overlively
overmature
overmellow
overmighty
overminute
overmodest
overnarrow
overnormal
overpained
overpotent
overprolix
overprompt
overremiss
overriding
overrigged
overserene
oversevere
oversilent
oversimple
overslight
oversmooth
oversocial
oversolemn
overspeedy
overstayed
oversteady
overstowed
overstrict
overstrong
overstrung
oversubtle
overtender
overwarmed
ovisaclike
oxidizable
oxychloric
List Of 11-Letter Adjectives Starting With “o”
objurgative
objurgatory
obliterable
obsessional
obsolescent
obstructive
ochlocratic
octachordal
octennially
odometrical
odoriferous
oecumenical
oesophageal
offenseless
offertorial
oleographic
omnifarious
omnipresent
onagraceous
oncological
ontogenetic
ontological
opencircuit
operational
opinionated
oppressible
opprobrious
organisable
organizable
organologic
orientative
origenistic
originative
orthodontic
orthophyric
orthopnoeic
orthoscopic
orthotropic
oscillatory
osteometric
osteopathic
osteophytic
ostracodous
ostrichlike
ostrogothic
ottomanlike
outstanding
outweaponed
overabusive
overadorned
overanxious
overassured
overbashful
overbearing
overbookish
overbooming
overcapable
overcareful
overcaustic
overclement
overcomplex
overcopious
overcunning
overcurious
overdefiant
overdevoted
overdistant
overdiverse
overearnest
overelegant
overenvious
overextreme
overfearful
overfertile
overfervent
overfleshed
overfoolish
overforward
overfragile
overfraught
overhappily
overhaughty
overhelpful
overhostile
overhurried
overintense
overjealous
overjocular
overlearned
overliberal
overlogical
overmettled
overnervous
overpainful
overpartial
overpatient
overpensive
overpiteous
overpolitic
overpopular
overprecise
overreliant
overscented
oversecured
overserious
overservile
overslavish
oversparing
overstuffed
overtedious
overthrifty
overvaliant
overviolent
overwealthy
overweening
overwilling
overwrought
overzealous
oxidational
oxidimetric
oxycephalic
ozoniferous
List Of 12-Letter Adjectives Starting With “o”
oblanceolate
obliterative
obreptitious
obstreperous
occupational
oleomargaric
oligocarpous
oligophagous
oligophrenic
oligotrophic
onomatologic
ophicleidean
ophiolatrous
ophiological
ophthalmitic
opinionative
oppositional
optometrical
orchidaceous
organicismal
organicistic
organoleptic
ornithologic
orthogenetic
orthographic
orthomorphic
orthopterous
orthorhombic
orthotropous
osteoblastic
osteogenetic
osteological
osteoplastic
ostracizable
ostrogothian
otherworldly
overabundant
overaffected
overanalyzed
overanimated
overattached
overboastful
overcaptious
overcareless
overcautious
overcerebral
overchildish
overclinical
overconstant
overcontrite
overcovetous
overcritical
overcultured
overdecadent
overdelicate
overderisive
overdesirous
overdetailed
overdiligent
overdiscreet
overdistrait
overdogmatic
overdramatic
overeffusive
overemphatic
overexacting
overexplicit
overfactious
overfaithful
overfamiliar
overfanciful
overfeminine
overflowable
overfrequent
overfruitful
overgenerous
overgracious
overgrasping
overgrateful
overgrievous
overinsolent
overliterary
overluscious
overmagnetic
overmerciful
overmournful
overnumerous
overobedient
overpopulous
overpositive
overpowerful
overpowering
overprolific
overpuissant
overrational
overreactive
overreserved
overresolute
overrigorous
oversanguine
oversensible
oversoothing
overspacious
overstraight
overstrident
overstudious
overtimbered
overtimorous
overtolerant
overtrustful
overtruthful
overturnable
overvaluable
overvehement
overvigorous
overwhelming
overwithered
oxygenizable
List Of 13-Letter Adjectives Starting With “o”
objectionable
objectivistic
oceanographic
ochlocratical
odontoblastic
odontographic
odontological
odontophorous
olericultural
oligochaetous
oligopolistic
ommatophorous
omnicompetent
ontogenetical
opportunistic
oppositionary
orchestraless
organographic
organological
oropharyngeal
orthocephalic
orthognathous
orthostichous
oscillometric
osteometrical
overambitious
overappareled
overassertive
overattentive
overbounteous
overbrilliant
overbumptious
overcherished
overcompliant
overconscious
overcontented
overcourteous
overcredulous
overdefensive
overdelicious
overdependent
overeducative
overemotional
overempirical
overexcitable
overexpansive
overexpectant
overexquisite
overexuberant
overfavorable
overgraduated
overimitative
overindulgent
overinhibited
overinsistent
overjudicious
overlaudatory
overluxuriant
overluxurious
overmasterful
overmelodious
overnegligent
overoffensive
overofficious
overpatriotic
overplausible
overplenteous
overplentiful
overpolemical
overpolitical
overponderous
overprominent
overprovident
overrealistic
overreligious
overrestraint
overrighteous
oversceptical
overskeptical
oversorrowful
oversqueamish
oversteadfast
overtalkative
overtechnical
overtenacious
overventurous
ovoviviparous
Related resource: List Of Words With The Prefix “ve”
List Of 14-Letter Adjectives Starting With “o”
occupationless
oligopsonistic
oneirocritical
onomatological
ophthalmologic
oppositionless
organisational
organizational
organometallic
ornithological
orobanchaceous
orthochromatic
overabstemious
overaggressive
overambitioned
overanalytical
overartificial
overassumptive
overburdensome
overcensorious
overcharitable
overcomplacent
overdecorative
overdepressive
overdistraught
overdogmatical
overelliptical
overemphatical
overexpressive
overfactitious
overfastidious
overfragmented
overfranchised
overhysterical
overidealistic
overidolatrous
overinclinable
overinterested
overlascivious
overlicentious
overmoralistic
overneglectful
overobsequious
overoptimistic
overornamental
overparticular
overpassionate
overperemptory
overproficient
overprosperous
overreflective
overscrupulous
oversolicitous
oversufficient
oversuspicious
oversystematic
overtheatrical
overthoughtful
List Of 15-Letter Adjectives 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
List Of 16-Letter Adjectives Starting With “o”
obstructionistic
ophthalmological
overappreciative
overapprehensive
overconservative
overenthusiastic
overillustrative
overinflationary
overintellectual
overmilitaristic
overpresumptuous
List Of 17-Letter Adjectives Starting With “o”
ophthalmometrical
ophthalmoscopical
otolaryngological
overargumentative
overcommunicative
overconscientious
overgesticulative
overproportionate
oversophisticated
oversuperstitious
Related resource: List Of Words With The Prefix “za”
List Of 18-Letter Adjectives Starting With “o”
overdiscriminating
overimpressionable
overrepresentative
