14 entries under substantial topic. ×
| unimportant(adjective, important) | |
| insignificant(adjective, important) | |
| trivial(adjective, important, unimportant, serious) | |
| paltry(adjective, poor, big, worthless) | |
| meager | |
| pitiful(adjective, good) | |
| zipper | |
| derisory | |
| doublespeak | |
| low-ranking | |
| purportless | |
| second rate(expression, unreasonable, liberal) | |
| unmeaning | |
| unpurposed |
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| APA | Smart Define. (2016). significant thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/significant/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, significant thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/significant/thesaurus/antonyms>. |
| MLA | Smart Define. "significant thesaurus" 4 March 2016. Web. 23 September 2026. <https://smartdefine.org/significant/thesaurus/antonyms> |