| unsure(adjective, clear, certain, doubtful, insecure) | |
| uncertain(adjective, clear, doubtful, changeable) | |
| doubtful(adjective, believing) | |
| dubious(adjective, clear, honest, doubtful) | |
| iffy(adjective, uncertain) | |
| indefinite(adjective, certain, doubtful, vague, unsure) | |
| insecure(adjective, strong, uncertain, steady, worried) | |
| problematic(adjective, clear, open) | |
| shaky(adjective, strong, sound, doubtful) | |
| undecided(adjective, definite, sure) | |
| wavering | |
| ambiguous(adjective, clear, plain) | |
| debatable(adjective, controversial) | |
| equivocal(adjective, uncertain, doubtful) | |
| feeble | |
| fictitious(adjective, honest, untrue, factual) | |
| hazardous(strong, safe) | |
| precarious(adjective, strong, stable, doubtful, tricky) | |
| risky(adjective, strong, safe, dangerous) | |
| unclear(adjective, clear) |
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| APA | Smart Define. (2016). sure thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/sure/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "sure thesaurus" https://smartdefine.org/sure/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, sure thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/sure/thesaurus/antonyms>. |
| MLA | Smart Define. "sure thesaurus" 31 March 2016. Web. 21 September 2026. <https://smartdefine.org/sure/thesaurus/antonyms> |