| analytical(adjective, clear, sound, reasonable, honest) | |
| authenticated(honest, certain, true, original, straight) | |
| authorised | |
| balanced | |
| believable(open, reasonable, honest, sensible, solid) | |
| capable | |
| certified | |
| coherent(clear, sound, reasonable, sensible, rational) | |
| commonsense(sound, reasonable, rational) | |
| condign(correct, fair, proper, just, legitimate) | |
| consequent(clear, sound, reasonable, sensible, rational) | |
| consequential(adjective, clear, effective, forceful, expressive) | |
| consistent(clear, sound, reasonable, sensible, rational) | |
| constitutional | |
| creditable(reasonable, pure, original, real, genuine) | |
| decisive(important, powerful, effective) | |
| deep(adjective, good, reasonable, sensible, solid) | |
| definite(adjective, clear, certain, established, unquestionable) | |
| definitive | |
| endorsed(adjective, legal, legitimate, approved, official) |
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| APA | Smart Define. (2016). valid thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/valid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "valid thesaurus" https://smartdefine.org/valid/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, valid thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/valid/thesaurus/synonyms>. |
| MLA | Smart Define. "valid thesaurus" 31 March 2016. Web. 20 September 2026. <https://smartdefine.org/valid/thesaurus/synonyms> |