| concretely | (adverb) in concrete terms | - |
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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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| discreditably | (adverb) in a dishonorable manner or to a dishonorable degree | Synonyms: disgracefully, dishonorably, dishonourably, ignominiously, ingloriously, shamefully |
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| discreetly | (adverb) with discretion; prudently and with wise self-restraint | - |
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| increasingly | (adverb) advancing in amount or intensity | Synonyms: more and more, progressively |
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| incredibly | (adverb) not easy to believe | Synonyms: implausibly, improbably, unbelievably |
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| (adverb) exceedingly; extremely | Synonyms: fabulously, fantastically |
| incredulously | (adverb) in an incredulous manner | Synonyms: disbelievingly, unbelievingly |
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| indiscreetly | (adverb) without discretion or wisdom or self-restraint | - |
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| sacredly | (adverb) by religion | Synonyms: religiously |
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| screakily | (adverb) in a creaky manner | Synonyms: creakily, creakingly |
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| screamingly | (adverb) funny to the point where screams of laughter are excited | - |
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| secretively | (adverb) in a secretive manner; with a preference for secrecy | - |
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| secretly | (adverb) in secrecy; not openly | Synonyms: in secret, on the Q.T., on the QT |
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| (adverb) not openly; inwardly | - |