- Definitions|1
- Thesaurus|782
- Abbreviations|0
135 entries under adjective topic. ×
| sound(calm, good, strong, secure) | |
| just(good, sound, right, reasonable) | |
| solid(calm, good, strong, sound) | |
| valid(good, sound, right, reasonable) | |
| well-grounded(good, reason, proper, logical) | |
| cogent(good, sound, correct, reasonable) | |
| plausible(true, probable) | |
| rational(sound, reasonable, reason, logical) | |
| reasonable(sound, correct, reason, sensible) | |
| reliable(calm, good, strong, secure) | |
| strong(calm, good, sound, right) | |
| firm(calm, strong, sound, heavy) | |
| legitimate(good, sound, right, reasonable) | |
| likely(true, probable) | |
| secure(calm, good, strong, sound) | |
| sensible(reasonable, reason, natural, valid) | |
| stable(strong, sound, secure, tough) | |
| substantial(calm, good, strong, sound) | |
| tenable(reasonable, justified, defensible) | |
| sane(reason, sane) |
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| APA | Smart Define. (2016). well-founded thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/well-founded/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "well-founded thesaurus" https://smartdefine.org/well-founded/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, well-founded thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/well-founded/thesaurus/synonyms>. |
| MLA | Smart Define. "well-founded thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/well-founded/thesaurus/synonyms> |