| funny(adjective, humorous, comical) | |
| playful(adjective, funny) | |
| humorous(adjective, funny, comical) | |
| minor | |
| silly(adjective, foolish, absurd, giddy) | |
| goofy | |
| unimportant(adjective, false, value, important, dishonest) | |
| less important | |
| sentimental(hard, cool) | |
| trivial(adjective, substantial) | |
| light(adjective, dull, obscure, false, funny) | |
| absurd | |
| frivolous(adjective, silly, trivial) | |
| flippant(adjective, irreverent) | |
| unserious | |
| crazy | |
| giddy(adjective, silly, impulsive) | |
| jocular(adjective, funny) | |
| lighthearted | |
| lightweight |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/serious/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/serious/thesaurus/antonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 23 September 2026. <https://smartdefine.org/serious/thesaurus/antonyms> |