| preventable | |
| questioning | |
| reluctant(careless, enthusiastic) | |
| shadowy | |
| skeptical | |
| suspect | |
| suspicious | |
| swerving | |
| tentative(adjective, uncertain, indefinite, conditional, experimental) | |
| touch-and-go(adjective, risky) | |
| treacherous | |
| troubled(happy, certain) | |
| unconfirmed | |
| unconvinced | |
| undefined(adjective, vague) | |
| undependable | |
| undetermined | |
| unfixed | |
| unpredictable | |
| unresolved(adjective, uncertain, settled) |
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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> |