| conversationally | (adverb) with the use of colloquial expressions | Synonyms: colloquially, informally |
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| conversely | (adverb) with the terms of the relation reversed | - |
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| convexly | (adverb) in a convex way | - |
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| convincingly | (adverb) in a convincing manner | - |
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| convivially | (adverb) in a convivial manner | - |
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| convulsively | (adverb) with convulsions, in a convulsive way | - |
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| coolly | (adverb) in a composed and unconcerned manner | Synonyms: nervelessly, nonchalantly |
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| cooperatively | (adverb) in close cooperation | Synonyms: hand and glove, hand in glove |
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| coordinately | (adverb) in a coordinated manner | - |
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| copiously | (adverb) in an abundant manner | Synonyms: abundantly, extravagantly, profusely |
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| coquettishly | (adverb) in a flirtatious manner | Synonyms: flirtatiously |
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| cordially | (adverb) in a hearty manner | Synonyms: heartily, warmly |
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| correctly | (adverb) in an accurate manner | Synonyms: aright, right |
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| correspondingly | (adverb) in a corresponding manner | - |
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| corruptedly | (adverb) in a corrupt manner | Synonyms: corruptly |
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| corruptly | (adverb) in a corrupt manner | Synonyms: corruptedly |
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| cortically | (adverb) with respect to the cortex | - |
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| cosily | (adverb) in a cozy manner | Synonyms: cozily |
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| cosmetically | (adverb) for cosmetic purposes to improve appearance | - |
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| coterminously | (adverb) in a coterminous manner | - |
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| counter | (adverb) in the opposite direction | - |
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| counteractively | (adverb) in a counteractive manner | - |
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| counterclockwise | (adverb) in a direction opposite to the direction in which the hands of a clock move | Synonyms: anticlockwise |
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| counterintuitively | (adverb) in a counterintuitive manner | - |
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| courageously | (adverb) in a courageous manner | Synonyms: bravely |
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| course | (adverb) as might be expected | Synonyms: naturally, of course |
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| courteously | (adverb) in a polite manner | Synonyms: politely |
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| covertly | (adverb) in a covert manner | - |
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| covetously | (adverb) in a greedy manner | Synonyms: avariciously, greedily |
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| (adverb) with jealousy; in an envious manner | Synonyms: enviously, jealously |
| coyly | (adverb) in a coy manner | - |
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| cozily | (adverb) in a cozy manner | Synonyms: cosily |
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