| solemn | |
| somber | |
| spineless | |
| stale | |
| stodgy | |
| stolid | |
| stumpy | |
| subservient | |
| unambitious | |
| uninteresting | |
| unmoving | |
| unobtrusive | |
| unselfconfident | |
| watery | |
| weak | |
| wearisome | |
| weary |
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| APA | Smart Define. (2015). pert thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/pert/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "pert thesaurus" https://smartdefine.org/pert/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, pert thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/pert/thesaurus/antonyms>. |
| MLA | Smart Define. "pert thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/pert/thesaurus/antonyms> |