| unthankful | (adjective) not feeling or showing gratitude | Synonyms: thankless, ungrateful |
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| unthawed | (adjective) still frozen | - |
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| untheatrical | (adjective) not suited to or characteristic of the stage or theater | - |
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| unthematic | (adjective) not relating to a melodic subject | - |
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| unthinkable | (adjective) incapable of being conceived or considered | - |
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| unthinking | (adjective) without care or thought for others | Synonyms: thoughtless, uncaring |
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| (adjective) mentally sluggish | Synonyms: lumpen, lumpish |
| (adjective) not exhibiting or characterized by careful thought | Synonyms: unreflective, unthoughtful |
| unthought | (adjective) so unexpected as to have not been imagined | Synonyms: unhoped-for, unhoped, unthought-of |
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| unthoughtful | (adjective) not exhibiting or characterized by careful thought | Synonyms: unreflective, unthinking |
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| unthreatening | (adjective) not unfriendly or threatening | Synonyms: well-meaning |
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