| unpressured | |
| unrequested | |
| unsolicited | |
| unsought | |
| unused(adjective, extraordinary, new, spare, fresh) | |
| up to the individual(expression, adjective, idiom, possible, voluntary) | |
| useless(adjective, casual, extra, worthless, unwarranted) | |
| wanton(extra, unwarranted, unnecessary, pointless, superfluous) | |
| wilful | |
| wished(adjective, free, deliberate, natural, willing) | |
| witting(adjective, free, deliberate, natural, willing) | |
| worthless(adjective, casual, useless, extra, unwarranted) | |
| absolute | |
| accessible | |
| accompanying(adjective, supplementary) | |
| accord | |
| add-on | |
| artless(natural, spontaneous, voluntary) | |
| at the call | |
| autarchic |
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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> |