| truehearted | (adjective) unwavering in devotion to friend or vow or cause | Synonyms: fast, firm, loyal |
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| trustworthy | (adjective) worthy of trust or belief | Synonyms: trusty |
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| (adjective) taking responsibility for one's conduct and obligations | - |
| unairworthy | (adjective) not fit to fly | - |
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| unalert | (adjective) not alert to what is potentially dangerous | Synonyms: unvigilant, unwatchful |
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| unarticulate | (adjective) without or deprived of the use of speech or words | Synonyms: inarticulate |
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| unarticulated | (adjective) not consisting of segments that are held together by joints | - |
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| (adjective) uttered without the use of normal words or syllables | - |
| unartistic | (adjective) lacking aesthetic sensibility | Synonyms: inartistic |
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| unascertainable | (adjective) not able to be ascertained; resisting discovery | Synonyms: undiscoverable |
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| unassertive | (adjective) inclined to timidity or lack of self-confidence | - |
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| uncertain | (adjective) not established beyond doubt; still undecided or unknown | - |
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| (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, unsure |
| (adjective) not certain to occur; not inevitable | - |
| (adjective) not established or confirmed | Synonyms: unsealed |
| (adjective) ambiguous (especially in the negative) | - |
| (adjective) not consistent or dependable | - |
| (adjective) subject to change | Synonyms: changeable, unsettled |
| uncertified | (adjective) lacking requisite official documentation or endorsement | - |
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| uncharted | (adjective) (of unknown regions) not yet surveyed or investigated | Synonyms: chartless, unmapped |
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| unchartered | (adjective) not chartered | - |
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| uncomfortable | (adjective) providing or experiencing physical discomfort | - |
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| (adjective) conducive to or feeling mental discomfort | - |
| uncompartmented | (adjective) not compartmented; not divided into compartments or isolated units | - |
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| unconverted | (adjective) not converted | Synonyms: unpersuaded |
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| unconvertible | (adjective) used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value | Synonyms: inconvertible, unexchangeable |
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| uncurtained | (adjective) not provided with curtains | Synonyms: curtainless |
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| undistorted | (adjective) without alteration or misrepresentation | - |
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| unearthly | (adjective) suggesting the operation of supernatural influences | Synonyms: eldritch, uncanny, weird |
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| (adjective) concerned with or affecting the spirit or soul | Synonyms: spiritual |
| unexportable | (adjective) not suitable for export | - |
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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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| unfortunate | (adjective) not favored by fortune; marked or accompanied by or resulting in ill fortune | - |
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| (adjective) not auspicious; boding ill | Synonyms: inauspicious |
| (adjective) unsuitable or regrettable | - |
| unhurt | (adjective) free from danger or injury | Synonyms: safe and sound |
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| (adjective) not injured or harmed | Synonyms: unharmed, unscathed, whole |
| unimportant | (adjective) not important | - |
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| (adjective) devoid of importance, meaning, or force | Synonyms: insignificant |
| unmortgaged | (adjective) (especially of a title) free from any encumbrance or limitation that presents a question of fact or law | Synonyms: clear |
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| unorthodox | (adjective) breaking with convention or tradition | - |
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| (adjective) independent in behavior or thought | Synonyms: irregular, maverick |
| unpartitioned | (adjective) not divided by partitions | - |
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| unperturbed | (adjective) free from emotional agitation or nervous tension | Synonyms: unflurried, unflustered, unruffled |
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| unportable | (adjective) not portable; not easily moved or transported | - |
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| unreportable | (adjective) (of income) not reportable; not required by law to be reported | - |
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| unreported | (adjective) not reported | - |
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| unseaworthy | (adjective) unfit for a voyage | - |
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| unsorted | (adjective) not categorized or sorted | Synonyms: uncategorised, uncategorized |
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| (adjective) not arranged according to size | - |
| unsporting | (adjective) violating accepted standards or rules | Synonyms: cheating, dirty, foul, unsportsmanlike |
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| unsportsmanlike | (adjective) violating accepted standards or rules | Synonyms: cheating, dirty, foul, unsporting |
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| unsupportable | (adjective) not able to be supported or defended | - |
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| unsupported | (adjective) not held up or borne | - |
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| (adjective) not sustained or maintained by nonmaterial aid | - |
| unsupportive | (adjective) not furnishing support or assistance | - |
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| untrustworthy | (adjective) not worthy of trust or belief | Synonyms: untrusty |
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| unworthy | (adjective) lacking in value or merit | - |
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| (adjective) morally reprehensible | Synonyms: despicable, slimy, ugly, vile, worthless, wretched |
| (adjective) not deserving | Synonyms: undeserving |
| upstart | (adjective) characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position | Synonyms: nouveau-riche, parvenu, parvenue |
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| vertebral | (adjective) of or relating to or constituting vertebrae | - |
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| vertebrate | (adjective) having a backbone or spinal column | - |
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| vertical | (adjective) at right angles to the plane of the horizon or a base line | Synonyms: perpendicular |
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| (adjective) upright in position or posture | Synonyms: erect, upright |
| (adjective) relating to or involving all stages of a business from production to distribution | - |
| (adjective) of or relating to different levels in a hierarchy (as levels of social class or income group) | - |
| verticillate | (adjective) forming one or more whorls (especially a whorl of leaves around a stem) | Synonyms: verticillated, whorled |
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| verticillated | (adjective) forming one or more whorls (especially a whorl of leaves around a stem) | Synonyms: verticillate, whorled |
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| vertiginous | (adjective) having or causing a whirling sensation; liable to falling | Synonyms: dizzy, giddy, woozy |
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| virtual | (adjective) existing in essence or effect though not in actual fact | - |
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| (adjective) being actually such in almost every respect | Synonyms: practical |
| virtuoso | (adjective) having or revealing supreme mastery or skill | Synonyms: consummate, masterful, masterly |
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| virtuous | (adjective) morally excellent | - |
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| (adjective) in a state of sexual virginity | Synonyms: pure, vestal, virgin, virginal |
| warmhearted | (adjective) marked by warmth of feeling like kindness and sympathy and generosity | - |
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| wartlike | (adjective) (of skin) covered with warts or projections that resemble warts | Synonyms: verrucose, warty |
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| warty | (adjective) (of skin) covered with warts or projections that resemble warts | Synonyms: verrucose, wartlike |
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| watertight | (adjective) without flaws or loopholes | Synonyms: bulletproof, ironclad, unassailable, unshakable |
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| (adjective) not allowing water to pass in or out | - |
| wholehearted | (adjective) with unconditional and enthusiastic devotion | Synonyms: heart-whole, whole-souled |
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| worth | (adjective) having a specified value | - |
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| (adjective) (often used ironically) worthy of being treated in a particular way | Synonyms: deserving |
| worthful | (adjective) having worth or merit or value | Synonyms: valuable |
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| worthless | (adjective) lacking in usefulness or value | - |
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| (adjective) morally reprehensible | Synonyms: despicable, slimy, ugly, unworthy, vile, wretched |
| worthwhile | (adjective) sufficiently valuable to justify the investment of time or interest | - |
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| worthy | (adjective) having worth or merit or value; being honorable or admirable | - |
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| (adjective) worthy of being chosen especially as a spouse | Synonyms: desirable, suitable |
| (adjective) having qualities or abilities that merit recognition in some way | - |