| 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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