43 entries under reasonable topic. ×
| attested(good, sound, right, rational) | |
| cogent(sound, rational, valid, lawful) | |
| compelling(sound, rational) | |
| convincing(sound, pure, rational, original) | |
| defensible(sound, rational) | |
| determinative(sound, rational) | |
| efficacious(good, sound, right, rational) | |
| in force(expression, good, sound, right) | |
| logical(good, sound, right, rational) | |
| persuasive(good, sound, right, rational) | |
| proven(sound, rational, accepted, permitted) | |
| rational | |
| solid(good, sound, right, rational) | |
| stringent(good, sound, right, rational) | |
| strong(good, sound, right, rational) | |
| telling(sound, rational) | |
| tested(good, sound, right, rational) | |
| ultimate(sound, rational) | |
| unadulterated(good, sound, right, true) | |
| unanswerable(good, sound, right, rational) |
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| APA | Smart Define. (2015). official thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/official/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "official thesaurus" https://smartdefine.org/official/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, official thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/official/thesaurus/synonyms>. |
| MLA | Smart Define. "official thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/official/thesaurus/synonyms> |