| confident(adjective, weak, timid) | |
| certain(adjective, confident, valid, undoubtable) | |
| sure(adjective, certain, definite, inevitable) | |
| clear(adjective, ambiguous, filled) | |
| definite(adjective, obscure) | |
| desirous | |
| unquestionable(adjective, definite) | |
| assured(verb, unsure, indefinite) | |
| settled(verb, adjective) | |
| conclusive | |
| indisputable | |
| indubitable(adjective, undoubted) | |
| well-documented | |
| convinced(verb, adjective) | |
| credible | |
| absolute | |
| definitive | |
| incontestable | |
| incontrovertible | |
| inevitable(adjective, certain, distant) |
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| APA | Smart Define. (2016). doubtful thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/doubtful/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "doubtful thesaurus" https://smartdefine.org/doubtful/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, doubtful thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/doubtful/thesaurus/antonyms>. |
| MLA | Smart Define. "doubtful thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/doubtful/thesaurus/antonyms> |