| unsound | |
| unsuitable(adjective, false, careless, uncertain) | |
| untiring(adjective, clear, exciting) | |
| untrained(adjective, unlikely, impossible) | |
| untrustworthy(adjective, false, careless, uncertain) | |
| untruth | |
| untruthful(adjective, false, careless, uncertain) | |
| unusual(adjective, extraordinary, original) | |
| unwise(adjective, stupid) | |
| unworkable(adjective, unlikely, impossible) | |
| upset | |
| useless(adjective, unlikely, impossible) | |
| vague(adjective, false, careless, uncertain) | |
| varying(adjective, dishonest, equivocal) | |
| warm(adjective, friendly) | |
| warm-blooded(adjective, gentle) | |
| watery(adjective, clear, exciting) | |
| wet(adjective, clear, exciting) | |
| wily(adjective, dishonest, equivocal) | |
| worthless(adjective, unlikely, impossible) |
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| APA | Smart Define. (2015). matter of fact thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/matter_of_fact/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "matter of fact thesaurus" https://smartdefine.org/matter_of_fact/thesaurus/antonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, matter of fact thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/matter_of_fact/thesaurus/antonyms>. |
| MLA | Smart Define. "matter of fact thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/matter_of_fact/thesaurus/antonyms> |