| unfaceted | (adjective) lacking facets | - |
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| unfading | (adjective) of an imaginary flower that never fades | Synonyms: amaranthine |
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| unfailing | (adjective) tireless | Synonyms: unflagging |
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| (adjective) always able to supply more | - |
| (adjective) not liable to failure | Synonyms: foolproof |
| unfair | (adjective) not fair; marked by injustice or partiality or deception | Synonyms: unjust |
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| unfaithful | (adjective) not true to duty or obligation or promises | - |
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| (adjective) having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend | - |
| (adjective) having the character of, or characteristic of, a traitor | Synonyms: faithless, traitorous, treasonable, treasonous |
| (adjective) not trustworthy | - |
| unfaltering | (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steadfast, steady, stiff, unbendable, unshakable, unwavering |
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| unfamiliar | (adjective) not known or well known | - |
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| unfashionable | (adjective) not in accord with or not following current fashion | Synonyms: unstylish |
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| (adjective) unpopular and considered unappealing or unfashionable at the time | Synonyms: out of fashion |
| unfastened | (adjective) not closed or secured | - |
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| (adjective) not buttoned | Synonyms: unbuttoned |
| (adjective) not tied | Synonyms: untied |
| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: open |
| unfastidious | (adjective) marked by an absence of due or proper care or attention to detail; not concerned with cleanliness | - |
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| (adjective) not exacting in nutritional requirements | - |
| unfathomable | (adjective) of depth; not capable of being sounded or measured | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, abyssal |
| (adjective) incapable of being fully understood | - |
| unfathomed | (adjective) situated at or extending to great depth; too deep to have been sounded or plumbed | Synonyms: profound, unplumbed, unsounded |
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| unfattened | (adjective) (of market animals) not optimal for marketing | - |
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| unfavorable | (adjective) (of winds or weather) tending to hinder or oppose | Synonyms: unfavourable |
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| (adjective) not encouraging or approving or pleasing | Synonyms: unfavourable |
| (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: disadvantageous, unfavourable |
| unfavourable | (adjective) (of winds or weather) tending to hinder or oppose | Synonyms: unfavorable |
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| (adjective) not encouraging or approving or pleasing | Synonyms: unfavorable |
| (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: disadvantageous, unfavorable |