78 entries under adjective topic. ×
| large(important, useful) | |
| momentous | |
| peerless | |
| pivotal | |
| primeval | |
| primordial | |
| proper | |
| relevant | |
| rudimentary | |
| seminal | |
| serious | |
| substantial | |
| urgent | |
| useful | |
| valuable(important, useful) | |
| vital | |
| weighty | |
| worthwhile(important, useful) |
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| APA | Smart Define. (2015). secondary thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/secondary/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "secondary thesaurus" https://smartdefine.org/secondary/thesaurus/antonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, secondary thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/secondary/thesaurus/antonyms>. |
| MLA | Smart Define. "secondary thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/secondary/thesaurus/antonyms> |