| ceaselessly | (adverb) with unflagging resolve | Synonyms: continuously, endlessly, incessantly, unceasingly, unendingly |
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| centennially | (adverb) every hundred years; once in a century | - |
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| centrally | (adverb) in or near or toward a center or according to a central role or function | - |
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| cerebrally | (adverb) in the brain | - |
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| (adverb) in an intellectual manner | - |
| ceremonially | (adverb) in a ceremonial manner | Synonyms: ritually |
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| (adverb) in a ceremonious manner | Synonyms: ceremoniously |
| ceremoniously | (adverb) in a ceremonious manner | Synonyms: ceremonially |
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| certainly | (adverb) definitely or positively (`sure' is sometimes used informally for `surely') | Synonyms: for certain, for sure, sure, sure as shooting, sure enough, surely |
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