- Definitions|0
- Thesaurus|50
- Abbreviations|0
| ineffective(adjective, empty, worthless, frivolous, futile) | |
| insincere | |
| jesting | |
| light-hearted | |
| nugatory(adjective, empty, worthless, frivolous, ineffective) | |
| of no avail(expression, adjective, idiom, empty, worthless) | |
| otiose(adjective, empty, worthless, frivolous, ineffective) | |
| rambling(adjective, empty, worthless, frivolous, ineffective) | |
| schtick | |
| slapdash | |
| tongue-in-cheek(adjective, ironic, insincere) | |
| unavailing(adjective, empty, worthless, frivolous, ineffective) | |
| unhelpful(adjective, empty, worthless, frivolous, ineffective) | |
| unnecessary(adjective, empty, worthless, frivolous, ineffective) | |
| unproductive(adjective, empty, worthless, frivolous, ineffective) | |
| unsuccessful(adjective, empty, worthless, frivolous, ineffective) | |
| useless(adjective, empty, worthless, frivolous, ineffective) | |
| vain(adjective, empty, worthless, frivolous, ineffective) | |
| vaudeville | |
| venial(adjective, pardonable) |
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| APA | Smart Define. (2015). not serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/not_serious/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "not serious thesaurus" https://smartdefine.org/not_serious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, not serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/not_serious/thesaurus/synonyms>. |
| MLA | Smart Define. "not serious thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/not_serious/thesaurus/synonyms> |