| unfailingly | (adverb) without fail | - |
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| unfairly | (adverb) in an unfair manner | Synonyms: below the belt |
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| unfaithfully | (adverb) in an unfaithful undependable unreliable manner | Synonyms: undependably, unreliably |
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| unfalteringly | (adverb) with determination; in a determined manner | Synonyms: determinedly, unshakably |
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| unfashionably | (adverb) in an unfashionable manner | - |
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| unfavorably | (adverb) showing disapproval; in a disparaging way | Synonyms: unfavourably |
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| unfavourably | (adverb) showing disapproval; in a disparaging way | Synonyms: unfavorably |
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| unfeelingly | (adverb) without compassionate feelings | - |
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| (adverb) in a callous way | Synonyms: callously |
| unfeignedly | (adverb) with sincerity; without pretense | Synonyms: sincerely, truly |
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| unforgettably | (adverb) in a memorable manner | Synonyms: memorably |
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| unforgivably | (adverb) in an unpardonable manner or to an unpardonable degree | Synonyms: inexcusably, unpardonably |
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| unforgivingly | (adverb) without forgiveness; in an unforgiving manner | - |
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| unfortunately | (adverb) by bad luck | Synonyms: alas, regrettably, unluckily |
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