| 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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| 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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| sacredly | (adverb) by religion | Synonyms: religiously |
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