Adjectives That Start With O

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There are a variety of adjectives that start with O. You could create a big list by adding the superlative and comparative variants of adjectives starting with O. Here are some commonly used modifying words, including definitions and examples with a separate list of adjectives starting with O to describe a person.

It’s impossible to live in a universe without nouns. Nouns love to be decorated somehow, which is why adjectives are involved. They’re interesting and vibrant. We’ve got the standard descriptors such as “authentic” and “attentive.” An adjective is one of the nine parts of speech.

List of Adjectives That Start With O

Let’s look at this positive collection of words, starting with all the popular adjectives that start with O. Adjectives that start with O improve your vocabulary, help you become a crossword expert.

1Oafish457Optimal
2Oak458Optimific
3Oaken459Optimistic
4Obdurant460Optimum
5Obdurate461Optional
6Obedible462Optoelectronic
7Obedient463Optokinetic
8Obediential464Optomotor
9Obedt465Optospintronic
10Obeisant466Optothermal
11Obeisaunt467Optotypic
12Obese468Optronic
13Obfuscatory469Opulent
14Obituary470Opuntiaceous
15Object-based471Oracular
16Objectionable472Oral
17Objectional473Orange
18Objective474Orangey
19Objectless475Orangish
20Object-oriented476Orangy
21Objectual477Oratorial
22Oblate478Oratorian
23Oblationary479Oratorical
24Obligate480Orbicular
25Obligated481Orbiculate
26Obligational482Orbital
27Obligatory483Orbitary
28Obliged484Orbitual
29Obliging485Orbless
30Oblike486Orblike
31Oblimin487Orchestral
32Oblique488Orchestrated
33Obliquid489Orcish
34Oblite490Ordained
35Obliterable491Ordeal
36Obliterated492Orderable
37Obliterative493Ordered
38Oblivious494Orderly
39Oblong495Ordinal
40Obnoxious496Ordinary
41Obscene497Ordinate
42Obscurant498Ordurous
43Obscure499Orectic
44Obsequious500Oregonian
45Observable501Organic
46Observant502Organismal
47Observational503Organismic
48Observed504Organized
49Observing505Orgasmic
50Obsessed506Orgastic
51Obsessional507Orgiastic
52Obsessive508Orgulous
53Obsignatory509Orient
54Obsolescent510Oriental
55Obsolete511Orientated
56Obsoleter512Orientating
57Obstacle-ridden513Orientational
58Obstacular514Oriented
59Obstetric515Orienting
60Obstetrical516Origenian
61Obstetricious517Origenist
62Obstetrick518Origenistic
63Obstinant519Originable
64Obstinate520Original
65Obstreperous521Originary
66Obstructed522Originative
67Obstructive523Originless
68Obstruent524Orinasal
69Obtainable525Orinocan
70Obtrusive526Orkish
71Obtuse527Ornamental
72Obtuse-angled528Ornate
73Obverse529Ornery
74Obviating530Ornithogenic
75Obvious531Ornithological
76Occasional532Ornithophilous
77Occidental533Orogastric
78Occipital534Orogenic
79Occluded535Orogenital
80Occlusal536Orographic
81Occluse537Orographical
82Occlusional538Orolabial
83Occlusive539Orolingual
84Occulent540Orological
85Occulomotor541Oromucosal
86Occult542Oronasal
87Occultic543Oroqen
88Occultistic544Orosensory
89Occultive545Orosirian
90Occultural546Orotund
91Occupational547Orphaned
92Occupiable548Orphic
93Occupied549Orthodontic
94Occurrent550Orthodox
95Ocean-going551Orthoepic
96Oceanic552Orthogenetic
97Oceanward553Orthogenic
98Ocellar554Orthognathic
99Ocellated555Orthogonal
100Ocher556Orthograde
101Ochre557Orthologous
102Ochreous558Orthometric
103Ochrous559Orthopedic
104Ocreate560Orthoptic
105Octabasic561Orthorhombic
106Octacore562Orthostatic
107Octacosanoic563Orthotopic
108Octacyclic564Orthotropic
109Octagonal565Orwellian
110Octahedral566Os
111Octal567Oscillating
112Octameric568Oscillatory
113Octangular569Oscine
114Octanoic570Oscitant
115Octogenarian571Osculating
116Octogynous572Osculatory
117Octoic573Osmobiotic
118Octoid574Osmolar
119Octolateral575Osmometric
120Octolocular576Osmotic
121Octonary577Osseous
122Octonionic578Ossicular
123Octonocular579Ossiculate
124Octopaminergic580Ossiferous
125Octopartite581Ossified
126Octopean582Ossom
127Octopetalous583Os-specific
128Octopian584Osteal
129Octopic585Ostensible
130Octopine586Ostensive
131Octoploid587Ostentatious
132Octopodal588Osteoarthritic
133Octopodous589Osteogenetic
134Octopoid590Osteogenic
135Octopoidal591Osteoid
136Octopolar592Osteopathic
137Octosyllabic593Osteoporotic
138Octuple594Ostial
139Ocular595Ostrich-like
140Odd596Other
141Oddish597Otherwise
142Odds-on598Other-worldly
143Odd-toed599Otic
144Odic600Otoscopic
145Odiferous601Ototoxic
146Odinic602Otter
147Odious603Otterless
148Odobenine604Otterlike
149Odometric605Out
150Odometrical606Out of work
151Odontoid607Out-and-out
152Odorant608Outback
153Odoriferous609Outboard
154Odorless610Outbound
155Odorous611Outbred
156Odourful612Outcast
157Odourless613Outclassed
158Oecumenic614Outcoming
159Oecumenical615Outcut
160Oedematous616Outdacious
161Oedipal617Outdate
162Oenological618Outdated
163Oenophilic619Outdoor
164Oestral620Outdoorsy
165Oestrogenic621Outer
166Oestrous622Outermost
167Off623Outfitted
168Off-air624Outflowing
169Off-base625Outflung
170Off-beam626Outgoing
171Offbeat627Outgunned
172Off-book628Outjutting
173Off-broadway629Outland
174Off-campus630Outlandish
175Off-center631Outlaw
176Off-colour632Outlawed
177Offduty633Outlined
178Offenceless634Outlying
179Offended635Outmoded
180Offending636Outmost
181Offensive637Out-of-body
182Off-field638Out-of-character
183Off-guard639Out-of-context
184Offhand640Out-of-court
185Off-hand641Out-of-date
186Official642Out-of-order
187Officiary643Out-of-pocket
188Officinal644Out-of-print
189Officious645Out-of-service
190Offish646Out-of-state
191Off-key647Out-of-town
192Off-kilter648Out-of-work
193Off-limits649Outraged
194Offline650Outrageous
195Off-line651Outright
196Off-peak652Outshore
197Off-piste653Outside
198Off-put654Outsize
199Offputting655Outsized
200Off-putting656Outspoken
201Off-road657Outspread
202Off-sale658Outstanding
203Offscreen659Outward
204Off-screen660Ouvrierist
205Offshore661Oval
206Offside662Ovaloid
207Offsides663Ovarian
208Offsite664Ovate
209Off-site665Ovation
210Offstage666Ovenproof
211Off-street667Oven-proof
212Off-target668Over
213Off-the-ball669Overabundant
214Off-the-cuff670Overachiever
215Off-the-peg671Overachieving
216Off-the-rack672Overactive
217Off-the-record673Overage
218Off-the-shelf674Overaged
219Off-the-shoulder675Overaggressive
220Off-the-wall676Overalert
221Off-track677Overall
222Off-white678Overalled
223Oft-repeated679Overanxious
224Ogival680Overapt
225Ogreish681Overarm
226Ohmic682Overattentive
227Oily683Overawed
228OK684Overbanked
229Okay685Overbearing
230Old686Overblown
231Olde687Overbold
232Olden688Overbooked
233Older689Overbreathed
234Oldest690Overburdened
235Oldfashioned691Overbusy
236Old-fashioned692Overcareful
237Old-growth693Overcast
238Old-hat694Overcautious
239Oldish695Overcharged
240Oldline696Overcivilized
241Old-line697Overclad
242Old-maidish698Overclaimed
243Old-school699Overclear
244Old-time700Overclose
245Old-world701Overclothed
246Ole702Overcluttered
247Oleaceous703Overcoached
248Oleaginous704Overcoated
249Oleanolic705Overcoatless
250Olefinic706Overcoming
251Oleic707Overcommitted
252Olent708Overcomplicated
253Oleochemical709Overconcerned
254Oleographic710Overconfident
255Oleophilic711Overconscientious
256Oleophobic712Overconscious
257Oleoresinous713Overconsiderate
258Oleose714Overcounted
259Oleraceous715Overcritical
260Olfactive716Overcurious
261Olfactory717Overdamped
262Oligaemic718Overdelicate
263Oligarchic719Overdependent
264Oligarchical720Overdetermined
265Oligomeric721Overdeveloped
266Oligopolistic722Overdocumented
267Oligosaline723Overdominant
268Oligosemic724Overdone
269Oligosynaptic725Overdoped
270Oligotrichous726Overdosed
271Oligotrophic727Overdramatic
272Oliguric728Overdressed
273Olivary729Overdue
274Olive730Overeager
275Olivelike731Overeducated
276Olympian732Over-educated
277Olympic733Over-elaborate
278Omakase734Overemotional
279Omani735Overemphatic
280Omasal736Overenthusiastic
281Ominous737Overexcitable
282Omissible738Overexcited
283Omissive739Overexerted
284Ommatidial740Overexerting
285Omnibus741Overexposed
286Omnidirectional742Overextended
287Omnipotent743Overfamiliar
288Omnipresent744Overfatigued
289Omniscient745Overfed
290Omnivorous746Overflowing
291Omohyoidean747Overfocused
292Omophagic748Overfond
293Omophagous749Over-fond
294Omosternal750Overforceful
295Omotic751Overforested
296Omphacine752Overforward
297Omphacitic753Overfragrant
298Omphalic754Overfraught
299Omphalinoid755Overfree
300On756Overfreighted
301On-air757Overfrequent
302Onanistic758Overfriendly
303On-camera759Overfriezed
304On-campus760Overfruitful
305Once-removed761Overfucked
306Oncogenetic762Overful
307Oncogenic763Overfulfilled
308Oncogenomic764Overfull
309Oncologic765Overfurnished
310Oncological766Overfussy
311Oncoming767Overgenerous
312One768Overgreedy
313One-armed769Overgrown
314One-day770Overhand
315One-eighth771Overhanded
316One-eyed772Overhasty
317One-fifth773Overhead
318One-fourth774Overheated
319One-gallused775Overhyped
320One-half776Overinclusive
321One-handed777Overindebted
322Oneiric778Overindulgent
323One-legged779Overinformed
324One-ninth780Overintense
325One-note781Overinvested
326One-off782Overinvolved
327One-on-one783Overionized
328One-piece784Overish
329One-pot785Overjealous
330One-quarter786Overjittery
331Onerous787Overjoyed
332One-seventh788Overjoyous
333One-shot789Overjubilant
334Onesided790Overjust
335One-sided791Overkeen
336One-sixth792Overladen
337One-stop793Overland
338One-tenth794Overlarge
339One-third795Overlayered
340Onetime796Overloaded
341One-time797Overlookable
342One-to-one798Overlooked
343One-touch799Overly
344One-track800Overlying
345One-way801Overmastering
346Ongoing802Overmighty
347On-going803Overmodest
348On-hand804Overmotivated
349Onioned805Overmuch
350Onionless806Overmuscled
351Onionlike807Overneat
352Oniony808Overnew
353Oniric809Overnice
354Onirocritic810Overnight
355Onkus811Overnighter
356Onlest812Overoptimistic
357Onlie813Overpessimistic
358Online814Overplayful
359On-line815Over-polite
360Onlooking816Overpriced
361Only817Overproof
362On-off818Overprotective
363Onomastic819Overproud
364Onomatopoeic820Overqualified
365On-road821Overraced
366Onrushing822Overracked
367On-scene823Overrank
368Onscreen824Overrash
369On-screen825Over-rated
370Onshore826Overreaching
371Onside827Overreactive
372Onsite828Over-reactive
373On-site829Overread
374Onstage830Overready
375On-stage831Overrefined
376On-the-job832Overriding
377On-the-spot833Overripe
378Ontic834Over-ripe
379Ontogenetic835Oversea
380Ontologic836Overseas
381Ontological837Oversensitive
382Onward838Over-sensitive
383Onygenaceous839Overserious
384Onymous840Oversewn
385Onyx841Oversexed
386Oo842Overshot
387Oob843Oversimplistic
388Oofy844Oversize
389Oolitic845Oversized
390Oozy846Overslow
391Opacating847Oversmoothed
392Opacifiable848Oversnowed
393Opacous849Oversocialized
394Opacular850Oversoft
395Opalescent851Oversolar
396Opaline852Oversolicitous
397Opaque853Oversophisticated
398Open854Oversparred
399Openable855Overspecific
400Open-air856Overspeeding
401Open-and-shut857Overstated
402Open-armed858Oversteered
403Open-book859Overstimulated
404Opencast860Overstrung
405Opencut861Overstuffed
406Opened862Oversubscribed
407Open-ended863Oversuspicious
408Open-eyed864Overt
409Open-faced865Over-the-counter
410Openhanded866Over-the-top
411Open-handed867Overtight
412Openhearted868Overtired
413Open-hearted869Overtouristed
414Open-hearth870Overtroubled
415Opening871Overtrusting
416Open-minded872Overturnable
417Open-mouthed873Overturned
418Open-plan874Overuniform
419Opensightly875Overvaliant
420Opensource876Overwater
421Opephoroid877Overweening
422Operable878Overweight
423Operant879Overwhelmed
424Operatic880Overwhelming
425Operating881Overwrought
426Operational882Overzealous
427Operationalist883Over-zealous
428Operative884Ovid
429Opercular885Oviform
430Operculate886Ovigerous
431Operculated887Oviparous
432Operose888Ovular
433Ophidian889Ovulational
434Ophiolitic890Ower
435Opiate891Owing
436Opinionated892Owlish
437Oppilative893Own
438Opponent894Owned
439Opportune895Ownerless
440Opportunist896Oxalic
441Opportunistic897Oxblood
442Opposable898Oxeyed
443Opposed899Ox-eyed
444Opposing900Oxidized
445Opposite901Oxlike
446Oppositional902Oxonian
447Oppositive903Oxyacetic
448Oppressed904Oxygenic
449Oppressional905Oxyntic
450Oppressive906Oxytocic
451Opprobrious907Oyster
452Opsonic908Oysterish
453Optative909Oysterless
454Opthalmic910Oysterlike
455Optic911Oystery
456Optical912Ozone-friendly

Adjectives That Start With O Info Graphics

Printable infographics are a great way to communicate a significant amount of details in a brief time in an entertaining way. The adjectives that start with O infographic can help teachers and students share their thoughts.

My Considerations

Since the Adjective is the main part of English reading, the importance of developing vocabulary cannot be undervalued without adjectives that start with O.

You can read the above simple list of English Adjectives that Start With O to improve your vocabulary.

Encourage your children to master these basic but commonly used adjectives that start with O, by following the simple example given above. Then, save this list about English Adjectives that Start with O, handy for future use.

If you enjoyed a printable infographic about English Adjectives that Start With O, I’d be very thankful if you’d help it spread by emailing it to your friends or sharing it on Pinterest, Reddit, Twitter, Instagram, or Facebook. Thank you!

Recap of we just learned

  • Adjectives That Start With O
  • List of Adjectives That Start With O
  • Adjectives That Start With O Info Graphics

If you’re having any doubts about the qualities of adjectives that start with O, you can leave a comment below, and we’ll attempt to give you feedback as early as possible. Thank you!

Explore the full list of adjectives that start with A to Z!

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