| unbearably | (adverb) to an unbearable degree | - |
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| unbecomingly | (adverb) without decorousness | Synonyms: indecorously |
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| unbeknown | (adverb) without someone's knowledge | Synonyms: unbeknownst |
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| unbeknownst | (adverb) without someone's knowledge | Synonyms: unbeknown |
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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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| unblinkingly | (adverb) showing no emotion | - |
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| unblushingly | (adverb) without blushing | - |
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