| unsubstantiated | |
| unsupported | |
| untrue | |
| volatile(certain, stable) | |
| about | |
| academic | |
| accidental | |
| act | |
| affrighted | |
| aflutter | |
| afraid | |
| alarmed | |
| alleged | |
| ambulatory | |
| annual | |
| answerable | |
| antsy | |
| anxious | |
| apocryphal | |
| apparent |
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| APA | Smart Define. (2016). sure thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sure/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "sure thesaurus" https://smartdefine.org/sure/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, sure thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sure/thesaurus/antonyms>. |
| MLA | Smart Define. "sure thesaurus" 31 March 2016. Web. 24 September 2026. <https://smartdefine.org/sure/thesaurus/antonyms> |