307 entries under adjective topic. ×
| unavailing | |
| unfavorable | |
| unfounded(wrong, fake, false, counterfeit) | |
| unpleasant | |
| unscientific(reasoning, worthless, unfounded) | |
| unusable(useless, unfit, inapplicable) | |
| vain(void, unsound, trifling, petty) | |
| absurd(foolish, unreasonable, fantastic, absurd) | |
| annulled | |
| baseless(foolish, unreasonable, worthless, unacceptable) | |
| bootless | |
| crazy(foolish, unreasonable, absurd, illogical) | |
| foolish(unreasonable, fantastic, absurd, irrational) | |
| futile | |
| handicapped(poor, inadequate, ineffective, ineffectual) | |
| helpless(incompetent, vulnerable, incapable) | |
| ill-suited(bad, useless, unfit) | |
| implausible(poor, false, unreasonable, inadequate) | |
| impracticable(useless, unfit, inapplicable) | |
| in poor health(expression, idiom, mean, sick) |
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| APA | Smart Define. (2016). invalid thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/invalid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "invalid thesaurus" https://smartdefine.org/invalid/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, invalid thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/invalid/thesaurus/synonyms>. |
| MLA | Smart Define. "invalid thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/invalid/thesaurus/synonyms> |