| craftily | (adverb) in an subtle, cunning manner | Synonyms: artfully, cunningly, foxily, knavishly, slyly, trickily |
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| crazily | (adverb) in an insane manner | Synonyms: dementedly, insanely, madly |
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| creakily | (adverb) in a creaky manner | Synonyms: creakingly, screakily |
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| creakingly | (adverb) in a creaky manner | Synonyms: creakily, screakily |
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| creatively | (adverb) in a creative manner | - |
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| credibly | (adverb) easy to believe on the basis of available evidence | Synonyms: believably, plausibly, probably |
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| creditably | (adverb) to a tolerably worthy extent | Synonyms: respectably |
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| credulously | (adverb) in a credulous manner | Synonyms: believingly |
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| criminally | (adverb) in violation of the law; in a criminal manner | - |
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| (adverb) in a shameful manner | Synonyms: reprehensively |
| crisply | (adverb) in a well delineated manner | Synonyms: sharply |
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| crisscross | (adverb) crossing one another in opposite directions | - |
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| critically | (adverb) in a critical manner | - |
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| crookedly | (adverb) in a crooked lopsided manner | Synonyms: lopsidedly |
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| crossly | (adverb) in an ill-natured manner | Synonyms: grouchily, grumpily |
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| crosstown | (adverb) across a town or city | - |
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| crossways | (adverb) transversely | Synonyms: across, crosswise |
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| crosswise | (adverb) transversely | Synonyms: across, crossways |
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| (adverb) not in the intended manner | - |
| crucially | (adverb) to a crucial degree | - |
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| crudely | (adverb) in a crude or unrefined manner | - |
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| (adverb) in a crude and unskilled manner | Synonyms: artlessly, inexpertly |
| cruelly | (adverb) excessively | - |
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| (adverb) with cruelty | - |
| crushingly | (adverb) in a crushing manner | - |
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| cryptically | (adverb) in a cryptic manner | Synonyms: enigmatically, mysteriously |
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| cryptographically | (adverb) in a cryptographic manner | - |
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