| obdurately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obstinately, pig-headedly, stubbornly |
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| obediently | (adverb) in an obedient manner | Synonyms: yieldingly |
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| objectionably | (adverb) in an obnoxious manner | Synonyms: obnoxiously, offensively |
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| objectively | (adverb) with objectivity | - |
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| obligatorily | (adverb) in a manner that cannot be evaded | Synonyms: compulsorily, mandatorily |
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| (adverb) in an obligatory manner | - |
| obligingly | (adverb) in accommodation | Synonyms: accommodatingly |
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| obliquely | (adverb) at an oblique angle | Synonyms: aslant, athwart |
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| (adverb) to, toward or at one side | Synonyms: sidelong, sideways |
| obnoxiously | (adverb) in an obnoxious manner | Synonyms: objectionably, offensively |
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| obscenely | (adverb) in a lewd and obscene manner | Synonyms: lewdly |
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| (adverb) to an obscene degree | - |
| obscurely | (adverb) in an obscure manner | - |
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| obsequiously | (adverb) in an obsequious manner | Synonyms: servilely, subserviently |
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| observably | (adverb) in a noticeable manner | Synonyms: noticeably, perceptibly |
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| observantly | (adverb) in an observant manner | Synonyms: observingly |
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| observingly | (adverb) in an observant manner | Synonyms: observantly |
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| obsessionally | (adverb) in a compulsive manner | Synonyms: compulsively, obsessively |
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| obsessively | (adverb) in a compulsive manner | Synonyms: compulsively, obsessionally |
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| obstinately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obdurately, pig-headedly, stubbornly |
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| obstreperously | (adverb) in manner that attracts attention | Synonyms: clamorously, loudly |
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| obstructively | (adverb) in an obstructive manner | Synonyms: hinderingly |
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| obtrusively | (adverb) in an obtrusive manner | - |
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| obtusely | (adverb) stupidly or insensitively | Synonyms: densely, dumbly |
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| obviously | (adverb) unmistakably (`plain' is often used informally for `plainly') | Synonyms: apparently, evidently, manifestly, patently, plain, plainly |
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