| 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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