- Definitions|2
- Thesaurus|4.6k
- Abbreviations|0
| unsure(adjective, clear, doubtful, insecure) | |
| uncertain(adjective, clear, doubtful, sure, changeable) | |
| doubtful(adjective, unclear, questionable, believing) | |
| undecided(adjective, definite, sure) | |
| dubious(adjective, doubtful, vague, unclear) | |
| shaky(adjective, strong, sound, doubtful) | |
| unreliable(adjective, clear, strong, counterfeit, uncertain) | |
| ambiguous(adjective, clear, plain) | |
| chancy(adjective, safe, risky, dangerous) | |
| dark | |
| ever-changing | |
| indefinite(adjective, counterfeit, uncertain, vague, ambiguous) | |
| problematic(adjective, clear, open) | |
| capricious | |
| changeable(adjective, calm, constant) | |
| contingent(adjective, essential, possible, conditional) | |
| erratic(adjective, calm, unpredictable, consistent, wandering) | |
| feeble | |
| fictitious(adjective, honest, untrue, factual) | |
| hazardous(adjective, strong, safe, unpredictable, dangerous) |
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| APA | Smart Define. (2016). certain thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/certain/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "certain thesaurus" https://smartdefine.org/certain/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, certain thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/certain/thesaurus/antonyms>. |
| MLA | Smart Define. "certain thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/certain/thesaurus/antonyms> |