| supererogatory | |
| superfluous | |
| supernumerary | |
| supervacaneous | |
| thing | |
| too late(expression, idiom, inutility) | |
| unbecomingness | |
| uncalled for(verb, phrasal verb, redundancy) | |
| undue | |
| unnecessary | |
| unnoticed | |
| unsuitability | |
| unsuitable | |
| untimely | |
| use vain efforts(expression, idiom, inutility) | |
| verbum sat sapienti(expression, idiom, warning) | |
| waste |
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| APA | Smart Define. (2013). un thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/un/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "un thesaurus" https://smartdefine.org/un/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2013, un thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/un/thesaurus/synonyms>. |
| MLA | Smart Define. "un thesaurus" 17 June 2013. Web. 24 September 2026. <https://smartdefine.org/un/thesaurus/synonyms> |