| reasonability | |
| reflection(noun, understanding, philosophy, idea, attention) | |
| regard(noun, understanding, attention, hope, consideration) | |
| saneness(noun, understanding, mind, reason, sense) | |
| school of philosophy(expression, idiom) | |
| school of thought(expression, idiom) | |
| science of being(expression, idiom) | |
| scrutiny(noun, understanding, attention, hope, consideration) | |
| seeing(noun, understanding, attention, hope, consideration) | |
| senses(noun, understanding, mind, sense, intelligence) | |
| set theory | |
| significancy(noun, good, understanding, point, burden) | |
| signification(noun, good, understanding, point, burden) | |
| sophistry | |
| sound mind(noun, expression, understanding, mind, sense) | |
| sound reasoning | |
| speculation(noun, understanding, mind, sense, intelligence) | |
| study(noun, understanding, philosophy, idea, attention) | |
| syllogistics(noun, science, reason, connection, sense) | |
| synthesis(noun, reason) |
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| APA | Smart Define. (2015). logic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/logic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "logic thesaurus" https://smartdefine.org/logic/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, logic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/logic/thesaurus/synonyms>. |
| MLA | Smart Define. "logic thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/logic/thesaurus/synonyms> |