35 entries under rational topic. ×
| authoritative(adjective, good, sound, correct, right) | |
| legal(adjective, good, sound, correct, right) | |
| lawful(adjective, good, sound, correct, right) | |
| conclusive(adjective, sound, reasonable, true) | |
| irrefutable(adjective, sound, reasonable, reliable) | |
| powerful(good, sound, right, reasonable) | |
| binding(sound, reasonable) | |
| confirmed(good, sound, right, reasonable, proper) | |
| potent(good, sound, right, reasonable) | |
| substantial(good, sound, right, reasonable) | |
| weighty(good, sound, right, reasonable) | |
| efficient(adjective, good, sound, right, reasonable) | |
| attested(good, sound, right, reasonable) | |
| cogent(sound, reasonable, valid, lawful) | |
| compelling(sound, reasonable) | |
| convincing(sound, reasonable, pure, original) | |
| defensible(sound, reasonable) | |
| determinative(sound, reasonable) | |
| efficacious(good, sound, right, reasonable) | |
| in force(expression, good, sound, right, reasonable) |
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| APA | Smart Define. (2015). official thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/official/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "official thesaurus" https://smartdefine.org/official/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, official thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/official/thesaurus/synonyms>. |
| MLA | Smart Define. "official thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/official/thesaurus/synonyms> |