49 entries under adjective topic. ×
| certain | |
| sure | |
| definite | |
| reliable | |
| believable | |
| good | |
| indubitable | |
| strong | |
| accurate | |
| authentic | |
| authoritative | |
| calculable | |
| careful | |
| confidential | |
| copper-bottomed | |
| credible | |
| dependable | |
| durable | |
| faithful | |
| genuine |
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| APA | Smart Define. (2015). iffy thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/iffy/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "iffy thesaurus" https://smartdefine.org/iffy/thesaurus/antonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, iffy thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/iffy/thesaurus/antonyms>. |
| MLA | Smart Define. "iffy thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/iffy/thesaurus/antonyms> |