| unflagging | (adjective) tireless | Synonyms: unfailing |
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| (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: indefatigable, tireless, unwearying |
| unflappable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: imperturbable |
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| unflattering | (adjective) showing or representing unfavorably | Synonyms: uncomplimentary |
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| unflavored | (adjective) without flavoring added | Synonyms: nonflavored, nonflavoured, unflavoured |
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| unflavoured | (adjective) without flavoring added | Synonyms: nonflavored, nonflavoured, unflavored |
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| unflawed | (adjective) without a flaw | Synonyms: flawless |
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| unfledged | (adjective) (of birds) not yet having developed feathers | Synonyms: immature |
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| (adjective) young and inexperienced | Synonyms: callow, fledgling |
| (adjective) (of an arrow) not equipped with feathers | Synonyms: fledgeless, unvaned |
| unflinching | (adjective) not shrinking from danger | Synonyms: unblinking, unintimidated, unshrinking |
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| unfluctuating | (adjective) not liable to fluctuate or especially to fall | Synonyms: firm, steady |
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| unflurried | (adjective) free from emotional agitation or nervous tension | Synonyms: unflustered, unperturbed, unruffled |
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| unflustered | (adjective) free from emotional agitation or nervous tension | Synonyms: unflurried, unperturbed, unruffled |
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