| opaquely | (adverb) in an opaque manner | - |
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| openly | (adverb) in an open way | - |
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| operationally | (adverb) in respect to operation | - |
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| operatively | (adverb) in a manner to produce an effect | - |
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| opportunely | (adverb) conveniently | - |
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| opposite | (adverb) directly facing each other | Synonyms: face-to-face, face to face |
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| oppositely | (adverb) in an opposite position | - |
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| oppressively | (adverb) in a heavy and oppressive way | - |
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| optically | (adverb) in an optical manner | - |
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| optimally | (adverb) in an optimal and most desirable way | - |
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| optimistically | (adverb) with optimism; in an optimistic manner | - |
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| optionally | (adverb) in an optional manner | - |
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| opulently | (adverb) in a sumptuous and opulent manner | Synonyms: sumptuously |
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