| second-fiddle(superior, important) | |
| second-string(superior, important) | |
| second best | |
| seize | |
| shun | |
| submission | |
| submit | |
| succeed | |
| succumb | |
| suggest | |
| suppress | |
| supreme | |
| sustain | |
| tatters | |
| temperate | |
| tentative | |
| ultimate | |
| unadvisable | |
| undergo | |
| unimportant(adjective, poor, inferior) |
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| APA | Smart Define. (2016). best thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/best/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "best thesaurus" https://smartdefine.org/best/thesaurus/antonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, best thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/best/thesaurus/antonyms>. |
| MLA | Smart Define. "best thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/best/thesaurus/antonyms> |