| shy(adjective, failing, lacking) | |
| insufficient(adjective, strong, poor, lacking, enough) | |
| inadequate(adjective, poor, incompetent, insufficient, defective) | |
| unsuitable(adjective, poor, insufficient) | |
| subpar | |
| meager(adjective, poor, small, inadequate, substantial) | |
| inferior(adjective, poor, insufficient) | |
| useless(adjective, poor, insufficient) | |
| unsatisfactory(adjective, poor, inadequate, acceptable, insufficient) | |
| poor(adjective, strong, noble, inadequate, insufficient) | |
| incompetent(adjective, poor, insufficient) | |
| jejune | |
| niggardly | |
| sub-par | |
| deficient(adjective, inadequate, imperfect) | |
| unequal(adjective, poor, insufficient) | |
| unfit(adjective, poor, insufficient) | |
| incapable(adjective, strong, fit, poor, insufficient) | |
| intolerable(adjective, poor, insufficient) | |
| skimpy(adjective, inadequate, generous, sparse) |
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| APA | Smart Define. (2016). adequate thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/adequate/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "adequate thesaurus" https://smartdefine.org/adequate/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, adequate thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/adequate/thesaurus/antonyms>. |
| MLA | Smart Define. "adequate thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/adequate/thesaurus/antonyms> |