| reserve(adjective, extraordinary, new, spare, fresh) | |
| secondary(adjective, additional) | |
| selective | |
| self-acting | |
| self-active | |
| self-determined | |
| self-determining | |
| special(adjective, extraordinary, new, spare, fresh) | |
| superfluous(adjective, extraordinary, new, spare, fresh) | |
| supernumerary(adjective, extraordinary, new, spare, fresh) | |
| supplemental(adjective, extraordinary, new, spare, fresh) | |
| supplementary(adjective, extraordinary, new, spare, fresh) | |
| surplus(adjective, extraordinary, new, spare, fresh) | |
| tip(adjective, extraordinary, new, spare, fresh) | |
| unbesought | |
| unconstrained(adjective, free, deliberate, natural, willing) | |
| uncritical(adjective, casual, useless, extra, worthless) | |
| uninfluenced | |
| unpaid(adjective, free, deliberate, natural, willing) | |
| unprescribed(adjective, free, deliberate, natural, willing) |
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| APA | Smart Define. (2015). optional thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/optional/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "optional thesaurus" https://smartdefine.org/optional/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, optional thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/optional/thesaurus/synonyms>. |
| MLA | Smart Define. "optional thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/optional/thesaurus/synonyms> |