| oafish | (adjective) ill-mannered and coarse and contemptible in behavior or appearance | Synonyms: boorish, loutish, neandertal, neanderthal, swinish |
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| oaken | (adjective) consisting of or made of wood of the oak tree | - |
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| oaten | (adjective) of or related to or derived from oats | - |
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| obdurate | (adjective) showing unfeeling resistance to tender feelings | Synonyms: flint, flinty, granitic, stony |
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| (adjective) stubbornly persistent in wrongdoing | Synonyms: cussed, obstinate, unrepentant |
| obedient | (adjective) dutifully complying with the commands or instructions of those in authority | - |
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| obese | (adjective) excessively fat | Synonyms: corpulent, rotund, weighty |
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| objectionable | (adjective) causing disapproval or protest | Synonyms: obnoxious |
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| (adjective) liable to objection or debate; used of something one might take exception to | Synonyms: exceptionable |
| objective | (adjective) undistorted by emotion or personal bias; based on observable phenomena | Synonyms: nonsubjective |
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| (adjective) serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes | Synonyms: accusative |
| (adjective) belonging to immediate experience of actual things or events | - |
| (adjective) emphasizing or expressing things as perceived without distortion of personal feelings or interpretation | - |
| oblanceolate | (adjective) (of a leaf shape) having a broad rounded apex and a tapering base | - |
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| oblate | (adjective) having the equatorial diameter greater than the polar diameter; being flattened at the poles | Synonyms: pumpkin-shaped |
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| obligate | (adjective) restricted to a particular condition of life | - |
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| obligated | (adjective) caused by law or conscience to follow a certain course | - |
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| obligational | (adjective) relating or constituting or qualified to create a legal or financial obligation | - |
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| obligatory | (adjective) morally or legally constraining or binding | - |
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| (adjective) required by obligation or compulsion or convention | - |
| obliged | (adjective) under a moral obligation to do something | Synonyms: duty-bound |
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| obliging | (adjective) showing a cheerful willingness to do favors for others | Synonyms: complaisant |
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| oblique | (adjective) slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled | - |
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| (adjective) indirect in departing from the accepted or proper way; misleading | Synonyms: devious |
| obliterable | (adjective) able to be obliterated completely | Synonyms: removable |
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| obliterate | (adjective) reduced to nothingness | Synonyms: blotted out, obliterated |
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| obliterated | (adjective) reduced to nothingness | Synonyms: blotted out, obliterate |
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| oblivious | (adjective) failing to keep in mind | Synonyms: forgetful |
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| (adjective) (followed by `to' or `of') lacking conscious awareness of | Synonyms: unmindful |
| oblong | (adjective) deviating from a square or circle or sphere by being elongated in one direction | - |
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| (adjective) (of a leaf shape) having a somewhat elongated form with approximately parallel sides | - |
| obnoxious | (adjective) causing disapproval or protest | Synonyms: objectionable |
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| obovate | (adjective) (of a leaf shape) egg-shaped with the narrower end at the base | - |
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| obscene | (adjective) suggestive of or tending to moral looseness | Synonyms: lewd, raunchy, salacious |
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| (adjective) designed to incite to indecency or lust | - |
| (adjective) offensive to the mind | Synonyms: abhorrent, detestable, repugnant, repulsive |
| obscure | (adjective) difficult to find | Synonyms: hidden |
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| (adjective) marked by difficulty of style or expression | Synonyms: dark |
| (adjective) not drawing attention | Synonyms: unnoticeable |
| (adjective) not famous or acclaimed | Synonyms: unknown, unsung |
| (adjective) not clearly expressed or understood | Synonyms: vague |
| (adjective) remote and separate physically or socially | Synonyms: apart, isolated |
| obsequious | (adjective) attempting to win favor from influential people by flattery | Synonyms: bootlicking, fawning, sycophantic, toadyish |
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| (adjective) attentive in an ingratiating or servile manner | - |
| observable | (adjective) capable of being seen or noticed | Synonyms: discernible, evident |
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| observant | (adjective) paying close attention especially to details | - |
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| (adjective) (of individuals) adhering strictly to laws and rules and customs | Synonyms: law-abiding |
| (adjective) quick to notice; showing quick and keen perception | Synonyms: observing |
| observational | (adjective) relying on observation or experiment | Synonyms: data-based, experimental |
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| observed | (adjective) discovered or determined by scientific observation | Synonyms: ascertained, discovered |
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| observing | (adjective) quick to notice; showing quick and keen perception | Synonyms: observant |
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| obsessed | (adjective) having or showing excessive or compulsive concern with something | Synonyms: haunted, preoccupied, taken up |
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| (adjective) influenced or controlled by a powerful force such as a strong emotion | Synonyms: possessed |
| obsessional | (adjective) characterized by or constituting an obsession | Synonyms: obsessive |
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| obsessive | (adjective) characterized by or constituting an obsession | Synonyms: obsessional |
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| obsolescent | (adjective) becoming obsolete | - |
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| obsolete | (adjective) no longer in use | Synonyms: disused |
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| (adjective) old; no longer valid or fashionable | Synonyms: out-of-date, outdated, superannuated |
| obstetric | (adjective) of or relating to or used in or practicing obstetrics | Synonyms: obstetrical |
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| obstetrical | (adjective) of or relating to or used in or practicing obstetrics | Synonyms: obstetric |
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| obstinate | (adjective) tenaciously unwilling or marked by tenacious unwillingness to yield | Synonyms: stubborn, unregenerate |
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| (adjective) resistant to guidance or discipline | Synonyms: contrary, perverse, wayward |
| (adjective) stubbornly persistent in wrongdoing | Synonyms: cussed, obdurate, unrepentant |
| obstreperous | (adjective) boisterously and noisily aggressive | - |
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| (adjective) noisily and stubbornly defiant | - |
| obstructed | (adjective) shut off to passage or view or hindered from action | - |
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| obstructive | (adjective) preventing movement | Synonyms: clogging, hindering, impeding |
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| obtainable | (adjective) capable of being obtained | Synonyms: getable, gettable, procurable |
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| obtrusive | (adjective) undesirably noticeable | - |
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| (adjective) sticking out; protruding | - |
| obtuse | (adjective) of an angle; between 90 and 180 degrees | - |
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| (adjective) (of a leaf shape) rounded at the apex | - |
| (adjective) slow to learn or understand; lacking intellectual acuity | Synonyms: dense, dim, dull, dumb, slow |
| (adjective) lacking in insight or discernment | Synonyms: purblind |
| obviating | (adjective) made impossible | Synonyms: preclusive |
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| obvious | (adjective) easily perceived and understood | - |
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| occasional | (adjective) occurring from time to time | - |
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| (adjective) occurring on a temporary or irregular basis | Synonyms: casual |
| (adjective) recurring or reappearing from time to time | Synonyms: periodic |
| (adjective) occurring or appearing at usually irregular intervals | Synonyms: episodic |
| occidental | (adjective) denoting or characteristic of countries of Europe and the western hemisphere | Synonyms: Hesperian |
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| occipital | (adjective) of or relating to the occiput | - |
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| occluded | (adjective) (of a substance) taken into and retained in another substance | Synonyms: sorbed |
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| (adjective) closed off | - |
| occlusive | (adjective) tending to occlude | - |
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| occult | (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mysterious, mystic, mystical, orphic, secret |
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| (adjective) hidden and difficult to see | - |
| occupational | (adjective) of or relating to the activity or business for which you are trained | - |
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| occupied | (adjective) held or filled or in use | - |
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| (adjective) seized and controlled as by military invasion | - |
| (adjective) having ones attention or mind or energy engaged | Synonyms: engaged |
| (adjective) resided in; having tenants | Synonyms: tenanted |
| occurrent | (adjective) presently occurring (either causally or incidentally) | - |
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| oceangoing | (adjective) used on the high seas | Synonyms: seafaring, seagoing |
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| oceanic | (adjective) relating to or occurring or living in or frequenting the open ocean | Synonyms: pelagic |
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| (adjective) constituting or living in the open sea | - |
| (adjective) resembling the ocean in apparent limitlessness in extent or degree | - |
| ocellated | (adjective) having ocelli | - |
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| ocher | (adjective) of a moderate orange-yellow color | Synonyms: ochre |
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| ochre | (adjective) of a moderate orange-yellow color | Synonyms: ocher |
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| octagonal | (adjective) of or relating to or shaped like an octagon | Synonyms: octangular |
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| octal | (adjective) of or pertaining to a number system having 8 as its base | - |
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| octangular | (adjective) of or relating to or shaped like an octagon | Synonyms: octagonal |
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| octogenarian | (adjective) being from 80 to 89 years old | - |
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| octosyllabic | (adjective) having or characterized by or consisting of eight syllables | - |
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| octuple | (adjective) having eight units or components | Synonyms: eight-fold, eightfold |
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| ocular | (adjective) of or relating to or resembling the eye | Synonyms: ophthalmic, optic, optical |
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| (adjective) relating to or using sight | Synonyms: optic, optical, visual |
| (adjective) visible | Synonyms: visual |
| odd | (adjective) not divisible by two | Synonyms: uneven |
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| (adjective) an indefinite quantity more than that specified | - |
| (adjective) of the remaining member of a pair | Synonyms: unmatched, unmated, unpaired |
| (adjective) beyond or deviating from the usual or expected | Synonyms: curious, funny, peculiar, queer, rum, rummy, singular |
| (adjective) not used up | Synonyms: left, left over, leftover, remaining, unexpended |
| (adjective) not easily explained | - |
| oddish | (adjective) somewhat strange | - |
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| odious | (adjective) unequivocally detestable | Synonyms: abominable, detestable, execrable |
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| odoriferous | (adjective) having a natural fragrance | Synonyms: odorous, perfumed, scented, sweet-scented, sweet-smelling, sweet |
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| (adjective) emitting an odor | Synonyms: odorous |
| odorless | (adjective) having no odor | Synonyms: inodorous, odourless |
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| odorous | (adjective) having odor or a characteristic odor | - |
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| (adjective) having a natural fragrance | Synonyms: odoriferous, perfumed, scented, sweet-scented, sweet-smelling, sweet |
| (adjective) emitting an odor | Synonyms: odoriferous |
| odourless | (adjective) having no odor | Synonyms: inodorous, odorless |
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| oecumenic | (adjective) concerned with promoting unity among churches or religions | Synonyms: ecumenic, ecumenical, oecumenical |
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| oecumenical | (adjective) of worldwide scope or applicability | Synonyms: cosmopolitan, ecumenical, general, universal, world-wide, worldwide |
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| (adjective) concerned with promoting unity among churches or religions | Synonyms: ecumenic, ecumenical, oecumenic |
| off | (adjective) not in operation or operational | - |
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| (adjective) (of events) no longer planned or scheduled | Synonyms: cancelled |
| (adjective) not performing or scheduled for duties | - |
| (adjective) in an unpalatable state | Synonyms: sour, turned |
| (adjective) below a satisfactory level | - |
| offbeat | (adjective) (informal) strikingly unconventional | Synonyms: far-out, kinky, quirky, way-out |
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| offenceless | (adjective) incapable of offending or attacking | Synonyms: offenseless |
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| offended | (adjective) emotionally hurt or upset or annoyed | Synonyms: injured, pained |
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| offending | (adjective) offending against or breaking a law or rule | - |
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| offenseless | (adjective) incapable of offending or attacking | Synonyms: offenceless |
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| offensive | (adjective) unpleasant or disgusting especially to the senses | - |
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| (adjective) causing anger or annoyance | - |
| (adjective) for the purpose of attack rather than defense | - |
| (adjective) morally offensive | Synonyms: unsavory, unsavoury |
| (adjective) violating or tending to violate or offend against | Synonyms: violative |
| (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, nauseous, noisome, queasy, sickening, vile |
| offhand | (adjective) casually thoughtless or inconsiderate | Synonyms: offhanded |
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| (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, extempore, impromptu, off-the-cuff, offhanded, unrehearsed |
| offhanded | (adjective) casually thoughtless or inconsiderate | Synonyms: offhand |
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| (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, extempore, impromptu, off-the-cuff, offhand, unrehearsed |
| official | (adjective) having official authority or sanction | - |
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| (adjective) of or relating to an office | - |
| (adjective) verified officially | - |
| (adjective) (of a church) given official status as a national or state institution | - |
| (adjective) conforming to set usage, procedure, or discipline | Synonyms: prescribed |
| officious | (adjective) intrusive in a meddling or offensive manner | Synonyms: busy, busybodied, interfering, meddlesome, meddling |
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| offish | (adjective) lacking cordiality; unfriendly | Synonyms: standoffish |
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| offshore | (adjective) (of winds) coming from the land | Synonyms: seaward |
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| (adjective) at some distance from the shore | - |
| offside | (adjective) illegally beyond a prescribed line or area or ahead of the ball or puck | Synonyms: offsides |
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| offsides | (adjective) illegally beyond a prescribed line or area or ahead of the ball or puck | Synonyms: offside |
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| offstage | (adjective) situated or taking place in the area of a stage not visible to the audience | - |
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| (adjective) concealed from public view or attention | Synonyms: backstage |
| ohmic | (adjective) of or relating to or measured in ohms | - |
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| oiled | (adjective) treated with oil | - |
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| oily | (adjective) coated or covered with oil | - |
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| (adjective) smeared or soiled with grease or oil | Synonyms: greasy |
| (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oleaginous, sebaceous |
| (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oleaginous, smarmy, soapy, unctuous |
| ok | (adjective) being satisfactory or in satisfactory condition | Synonyms: all right, cool, fine, hunky-dory, o.k., okay |
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| okay | (adjective) being satisfactory or in satisfactory condition | Synonyms: all right, cool, fine, hunky-dory, o.k., ok |
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| old | (adjective) of long duration; not new | - |
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| (adjective) (used especially of persons) having lived for a relatively long time or attained a specific age | - |
| (adjective) skilled through long experience | Synonyms: older |
| (adjective) (used for emphasis) very familiar | - |
| (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, smashing, swell |
| (adjective) just preceding something else in time or order | Synonyms: previous |
| (adjective) belonging to some prior time | Synonyms: erstwhile, former, one-time, onetime, quondam, sometime |