| APA | Smart Define. (2013). be cheerful thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/be_cheerful/thesaurus/antonyms |
| Chicago | Smart Define. 2013. "be cheerful thesaurus" https://smartdefine.org/be_cheerful/thesaurus/antonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2013, be cheerful thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/be_cheerful/thesaurus/antonyms>. |
| MLA | Smart Define. "be cheerful thesaurus" 18 May 2013. Web. 26 September 2026. <https://smartdefine.org/be_cheerful/thesaurus/antonyms> |