| crestfallen | |
| demure | |
| diffident | |
| egoless | |
| fainthearted | |
| frowsy | |
| insecure | |
| meekest | |
| nervous | |
| overmodest | |
| retiring | |
| self-critical | |
| self-distrustful | |
| self-doubting | |
| self-reproachful | |
| shamefaced | |
| unarrogant | |
| apprehensive | |
| atheist | |
| concerned |
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| APA | Smart Define. (2016). smug thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/smug/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "smug thesaurus" https://smartdefine.org/smug/thesaurus/antonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, smug thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/smug/thesaurus/antonyms>. |
| MLA | Smart Define. "smug thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/smug/thesaurus/antonyms> |