obliteration, n. extinction, [erasure], effacement, [removal].
oblivious, a. [unmindful], [unconscious], forgetful, heedless, disregardful.
obnoxious, a. [subject], [liable]; [offensive], [odious], [hateful], displeasing.
obscene, a. [smutty], [lewd], [gross], [indecent], [immodest], [indelicate], [ribald].
obscenity, n. [lewdness], [smut], [ribaldry], [indecency], bawdiness, [immodesty].
obscure, a. [abstruse], [vague], [recondite], [indefinite], [ambiguous]; [humble], inglorious, [mean], undistinguished; [secluded], [retired], [remote]; shaded, darkened.
obscure, v. [darken], obfuscate, [bedim], [eclipse]; involve, dissemble, [disguise], [confuse].
obscuring, n. obscuration, [obscurity].
obscurity, n. ambiguity, [vagueness]; [privacy], [seclusion], [retirement]; [darkness], obfuscation, obscuration.
obsequious, a. [sycophantic], [cringing], [fawning], deferential, [servile].