| resolute(adjective, hard, rough, harsh, pure) | |
| seasoned | |
| shown(adjective, tested) | |
| tested(verb, adjective, good, sound, right) | |
| truthful | |
| unchangeable(adjective, complete, certain, true, limited) | |
| undoubted(adjective, solid, certain, sure, confident) | |
| unfaltering(adjective, certain, steady, regular, limited) | |
| unqualified(adjective, certain, limited, definite, inflexible) | |
| unquestionable(adjective, solid, certain, real, sure) | |
| vested | |
| well-founded(good, sound, right, reasonable, rational) | |
| well-grounded(good, sound, right, reasonable, rational) | |
| well-set(adjective, firm, determined, usual, regular) | |
| abiding(adjective, certain, limited, definite, persistent) | |
| absolutely certain(expression, adjective, set, solid, certain) | |
| adduced(verb, evinced) | |
| allegiant(adjective, honest, pure, sure, constant) | |
| anal-retentive(adjective, persistent, obstinate, insistent, dogged) | |
| anointed |
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| APA | Smart Define. (2016). confirmed thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/confirmed/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "confirmed thesaurus" https://smartdefine.org/confirmed/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, confirmed thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/confirmed/thesaurus/synonyms>. |
| MLA | Smart Define. "confirmed thesaurus" 26 February 2016. Web. 22 September 2026. <https://smartdefine.org/confirmed/thesaurus/synonyms> |