| powerful | |
| valid(adjective, right, false, genuine, illegal) | |
| good | |
| healthy | |
| legitimate(adjective, false, improper, authentic, valid) | |
| real(adjective, obscure, false, uncertain, genuine) | |
| sound | |
| true(adjective, sound, reasonable, uncertain, dishonest) | |
| legal | |
| logical(adjective, sound, reasonable, obscure, illogical) | |
| strong | |
| authentic(adjective, fake, false) | |
| binding | |
| effectual | |
| reasoned | |
| validated | |
| well-grounded | |
| cogent(adjective, effective) | |
| relatable(adjective, useless, unfit, inapplicable) | |
| unexpired |
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| APA | Smart Define. (2016). invalid thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/invalid/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "invalid thesaurus" https://smartdefine.org/invalid/thesaurus/antonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, invalid thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/invalid/thesaurus/antonyms>. |
| MLA | Smart Define. "invalid thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/invalid/thesaurus/antonyms> |