| concavely | (adverb) in a concave way | - |
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| conceitedly | (adverb) with conceit; in a conceited manner | Synonyms: self-conceitedly |
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| conceivably | (adverb) within the realm of possibility | - |
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| conceptually | (adverb) in a conceptual manner | - |
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| concernedly | (adverb) in a manner showing concern | - |
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| concisely | (adverb) in a concise manner; in a few words | Synonyms: briefly, in brief, in short, shortly |
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| conclusively | (adverb) in a conclusive way | Synonyms: once and for all |
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| concretely | (adverb) in concrete terms | - |
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| concurrently | (adverb) overlapping in duration | Synonyms: at the same time |
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| disconcertingly | (adverb) in a disturbing or embarrassing manner | - |
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| inconceivably | (adverb) to an inconceivable degree | - |
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| inconclusively | (adverb) not conclusively | - |
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| unconcernedly | (adverb) in an indifferent manner | - |
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