| believably | (adverb) in a believable manner | - |
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| (adverb) easy to believe on the basis of available evidence | Synonyms: credibly, plausibly, probably |
| believingly | (adverb) in a credulous manner | Synonyms: credulously |
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| belike | (adverb) with considerable certainty; without much doubt | Synonyms: in all likelihood, in all probability, likely, probably |
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| disbelievingly | (adverb) in an incredulous manner | Synonyms: incredulously, unbelievingly |
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| unbelievably | (adverb) in an unbelievable manner | - |
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| (adverb) not easy to believe | Synonyms: implausibly, improbably, incredibly |
| unbelievingly | (adverb) in an incredulous manner | Synonyms: disbelievingly, incredulously |
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