111 entries under adjective topic. ×
| spectral | |
| sterile(meaningless, invalid, unsubstantiated, unsupported) | |
| tenuous | |
| trifling(slight, lower, value, inferior) | |
| unconcrete | |
| unconfirmed(meaningless, invalid, unsubstantiated, unsupported) | |
| unenforceable(worthless, unacceptable, meaningless, invalid) | |
| unfruitful(inferior, inadequate, limited, feeble) | |
| unnecessary(slight, lower, value, inferior) | |
| unratified(meaningless, invalid, unsubstantiated, unsupported) | |
| unsanctioned(void, unsound, puny, meaningless) | |
| unsound | |
| unsubstantial | |
| unsuccessful(inferior, inadequate, limited, feeble) | |
| value(slight, lower, inferior, insignificant) | |
| voided(meaningless, invalid, unsubstantiated, unsupported) | |
| weightless | |
| erroneous | |
| faulty | |
| impaired |
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| APA | Smart Define. (2015). null thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/null/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "null thesaurus" https://smartdefine.org/null/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, null thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/null/thesaurus/synonyms>. |
| MLA | Smart Define. "null thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/null/thesaurus/synonyms> |