| substantial | |
| meaningful | |
| cram | |
| down-to-earth | |
| effectual | |
| efficacious | |
| feasible | |
| invaluable | |
| lack | |
| lowly | |
| muddy | |
| mutually beneficial | |
| originative | |
| practicable | |
| prosperous | |
| realizable | |
| retiring | |
| sheepish | |
| thankful(adjective, worried, inconsiderate, productive, profitable) | |
| titanic |
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| APA | Smart Define. (2016). vain thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/vain/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "vain thesaurus" https://smartdefine.org/vain/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, vain thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/vain/thesaurus/antonyms>. |
| MLA | Smart Define. "vain thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/vain/thesaurus/antonyms> |