| unsmart | |
| unsteady | |
| upright | |
| wavering | |
| weak-minded | |
| witless | |
| wobbly | |
| wormhearted | |
| Hoover | |
| aboveboard | |
| absurd | |
| addled | |
| ageless | |
| aimless | |
| alternating | |
| apathetic | |
| arctic | |
| arrest | |
| asinine | |
| avail oneself of(expression, idiom, save, fill) |
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| APA | Smart Define. (2016). fast thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/fast/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "fast thesaurus" https://smartdefine.org/fast/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, fast thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/fast/thesaurus/antonyms>. |
| MLA | Smart Define. "fast thesaurus" 1 April 2016. Web. 24 September 2026. <https://smartdefine.org/fast/thesaurus/antonyms> |