| ineffective(adjective, strong, fit, successful) | |
| inefficient(adjective, sound, well, competent, wasteful) | |
| inutile | |
| otiose | |
| destructive | |
| detrimental | |
| harmful(adjective, bad, awkward, useless) | |
| hopeless | |
| inconvenient(adjective, bad, awkward, useless) | |
| injurious(adjective, bad, awkward, useless) | |
| meaningless(adjective, reasonable, use, value, worth) | |
| negative | |
| non-beneficial(adjective, gain, benefit, effect, result) | |
| nonfunctional | |
| trivial(adjective, important, substantial, serious) | |
| unhelpful(adjective, bad, awkward, useless, helpful) | |
| unimportant(adjective, value, important, substantial) | |
| unsuitable(adjective, bad, awkward, useless) | |
| unsustainable | |
| unuseable |
For more, visit
Useful on
Power Thesaurus
| 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> |