| unfearing | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, hardy, intrepid |
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| unfeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, infeasible, unworkable |
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| unfeathered | (adjective) having no feathers | Synonyms: featherless |
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| (adjective) not having feathers | - |
| unfed | (adjective) not fed | - |
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| (adjective) not given support | - |
| unfeeling | (adjective) devoid of feeling or sensation | - |
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| (adjective) devoid of feeling for others | Synonyms: hardhearted, stonyhearted |
| unfeigned | (adjective) not pretended; sincerely felt or expressed | Synonyms: genuine, true |
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| unfeminine | (adjective) not suitable for a woman | - |
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| unfenced | (adjective) not enclosed by a fence | - |
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| unfermented | (adjective) not soured or preserved | Synonyms: fresh, sweet |
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| unfertile | (adjective) incapable of reproducing | Synonyms: infertile, sterile |
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| unfertilised | (adjective) not having been fertilized | Synonyms: unfertilized, unimpregnated |
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| unfertilized | (adjective) not having been fertilized | Synonyms: unfertilised, unimpregnated |
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| unfettered | (adjective) not bound by shackles and chains | Synonyms: unchained, unshackled, untied |
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