| unfamiliar(adjective, extraordinary, unusual, original) | |
| unfeasible(adjective, unlikely, impossible) | |
| unfriendly(adjective, extraordinary, unusual, original) | |
| unimportant | |
| unintelligent(adjective, stupid) | |
| unknowledgeable(adjective, extraordinary, unusual, original) | |
| unknown(adjective, extraordinary, unusual, original) | |
| unlikely(adjective, impossible) | |
| unnecessary | |
| unprofessional(adjective, unimportant) | |
| unproficient(adjective, unlikely, impossible) | |
| unreal(adjective, false, careless, uncertain) | |
| unrealistic(adjective, irrational) | |
| unreasonable | |
| unreliable(adjective, false, careless, uncertain) | |
| unremarkable(adjective, extraordinary, unusual, original) | |
| unseasoned(adjective, unlikely, impossible) | |
| unsensible(adjective, unsound) | |
| unserviceable(adjective, unlikely, impossible) | |
| unskilled(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> |