| thoughtless | (adjective) showing lack of careful thought | - |
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| (adjective) without care or thought for others | Synonyms: uncaring, unthinking |
| thriftless | (adjective) careless of the future | - |
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| timeless | (adjective) unaffected by time | Synonyms: dateless |
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| tireless | (adjective) characterized by hard work and perseverance | Synonyms: hardworking, industrious, untiring |
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| (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: indefatigable, unflagging, unwearying |
| toeless | (adjective) lacking a toe or toes | - |
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| toneless | (adjective) lacking in tone or expression | - |
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| tongueless | (adjective) lacking a tongue | - |
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| (adjective) expressed without speech | Synonyms: mute, silent, unspoken, wordless |
| toothless | (adjective) lacking teeth | - |
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| (adjective) lacking necessary force for effectiveness | - |
| topless | (adjective) having no top | - |
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| (adjective) having the breasts uncovered or featuring such nudity | Synonyms: bare-breasted, braless |
| trackless | (adjective) having no tracks | - |
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| (adjective) lacking pathways | Synonyms: pathless, roadless, untracked, untrod, untrodden |
| treeless | (adjective) not wooded | Synonyms: unwooded |
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| tubeless | (adjective) of a tire; not needing an inner tube | - |
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| tuneless | (adjective) not having a musical sound or pleasing tune | Synonyms: unmelodious, untuneful |
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| unaccessible | (adjective) capable of being reached only with great difficulty or not at all | Synonyms: inaccessible |
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| unaddressed | (adjective) not addressed | - |
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| unaggressive | (adjective) not aggressive; not given to fighting or assertiveness | Synonyms: nonaggressive |
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| unblessed | (adjective) not provided with something desirable | - |
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| unconfessed | (adjective) not admitted | - |
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| underdressed | (adjective) inadequately or too informally clothed | - |
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| undressed | (adjective) having removed clothing | Synonyms: unappareled, unattired, unclad, ungarbed, ungarmented |
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| (adjective) of lumber or stone or hides; not finished or dressed | - |
| unessential | (adjective) not basic or fundamental | Synonyms: inessential |
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| unexpressed | (adjective) not made explicit | Synonyms: unsaid, unspoken, unstated, unuttered, unverbalised, unverbalized, unvoiced |
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| unexpressible | (adjective) defying expression | Synonyms: inexpressible |
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| unexpressive | (adjective) deliberately impassive in manner | Synonyms: deadpan, expressionless, impassive, poker-faced |
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| unimpressed | (adjective) not moved to serious regard | - |
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| unimpressionable | (adjective) not sensitive or susceptible to impression | - |
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| unimpressive | (adjective) not capable of impressing | - |
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| unnecessary | (adjective) not necessary | Synonyms: unneeded |
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| unprepossessing | (adjective) creating an unfavorable or neutral first impression | Synonyms: unpresentable |
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| unpressed | (adjective) (of clothing) not smoothed with heat | - |
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| unprocessed | (adjective) not altered from an original or natural state | - |
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| (adjective) not refined or processed | Synonyms: crude, unrefined |
| (adjective) not treated or prepared by a special process | - |
| unprofessional | (adjective) not characteristic of or befitting a profession or one engaged in a profession | - |
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| unprogressive | (adjective) old-fashioned and out of date | Synonyms: fusty, nonprogressive, standpat |
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| unrepressed | (adjective) not repressed | - |
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| unstressed | (adjective) not bearing a stress or accent | - |
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| unsuccessful | (adjective) not successful; having failed or having an unfavorable outcome | - |
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| (adjective) failing to accomplish an intended result | Synonyms: abortive, stillborn |
| unsuppressed | (adjective) given vent to | - |
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| useless | (adjective) having no beneficial use or incapable of functioning usefully | - |
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| valueless | (adjective) of no value | - |
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| viewless | (adjective) not having or expressing opinions or views | - |
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| voiceless | (adjective) deprived of the rights of citizenship especially the right to vote | Synonyms: disenfranchised, disfranchised, voteless |
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| (adjective) produced without vibration of the vocal cords | Synonyms: hard, surd, unvoiced |
| (adjective) being without sound through injury or illness and thus incapable of all but whispered speech | Synonyms: aphonic |
| (adjective) uttered without voice | Synonyms: breathed |
| voteless | (adjective) deprived of the rights of citizenship especially the right to vote | Synonyms: disenfranchised, disfranchised, voiceless |
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| wakeless | (adjective) (of sleep) deep and complete | Synonyms: heavy, profound, sound |
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| watercress | (adjective) of a moderate yellow-green color that is greener and deeper than moss green and yellower and darker than pea green | Synonyms: cress green, cresson |
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| waterless | (adjective) lacking sufficient water or rainfall | Synonyms: arid |
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| weaponless | (adjective) without a weapon | - |
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| weedless | (adjective) free from weeds | - |
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| weightless | (adjective) having little or no weight or apparent gravitational pull; light | - |
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| wheelless | (adjective) having no wheels or having no wheeled vehicles | - |
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| whiskerless | (adjective) having no beard | Synonyms: beardless |
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| wigless | (adjective) not wearing a wig | - |
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| windless | (adjective) without or almost without wind | - |
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| wingless | (adjective) lacking wings | - |
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| winless | (adjective) having no wins | - |
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| wireless | (adjective) having no wires | - |
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| witless | (adjective) (used as complement) to the utmost degree | Synonyms: shitless |
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| (adjective) (of especially persons) lacking sense or understanding or judgment | Synonyms: nitwitted, senseless, soft-witted |
| wordless | (adjective) expressed without speech | Synonyms: mute, silent, tongueless, unspoken |
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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 |
| wrinkleless | (adjective) not wrinkled or creased | Synonyms: unwrinkled |
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