| uncertain | |
| undetermined | |
| unintentional | |
| unpredictable | |
| unpremeditated | |
| unready | |
| unspecified | |
| unstable | |
| unsure | |
| unwitting | |
| up | |
| uprise | |
| vacillating | |
| vagabond | |
| wavering(adjective, weak, yielding) | |
| whimsical | |
| abrupt | |
| adaptable | |
| adieu | |
| adrift |
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| APA | Smart Define. (2016). set thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/set/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "set thesaurus" https://smartdefine.org/set/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, set thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/set/thesaurus/antonyms>. |
| MLA | Smart Define. "set thesaurus" 1 March 2016. Web. 21 September 2026. <https://smartdefine.org/set/thesaurus/antonyms> |