| dysfunctional(work, feature, state, adjective, function) | |
| useless(adjective, bad, sensible, awkward, valuable) | |
| not good | |
| lightweight | |
| not helpful | |
| bad(adjective, awkward, useless) | |
| worthless(adjective, bad, awkward, useless, valuable) | |
| unusable(adjective, bad, sensible, awkward, useless) | |
| futile | |
| ineffectual | |
| undeserving | |
| subpar | |
| unserviceable | |
| awkward(adjective, bad, useless) | |
| unavailing | |
| unprofitable(adjective, useless) | |
| baneful | |
| disadvantageous(adjective, bad, awkward, useless) | |
| feckless(adjective, purpose) | |
| fruitless(adjective, product) |
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| APA | Smart Define. (2016). useful thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/useful/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "useful thesaurus" https://smartdefine.org/useful/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, useful thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/useful/thesaurus/antonyms>. |
| MLA | Smart Define. "useful thesaurus" 5 January 2016. Web. 24 September 2026. <https://smartdefine.org/useful/thesaurus/antonyms> |