| more(adjective, extraordinary, new, spare, fresh) | |
| needless(adjective, extraordinary, new, spare, fresh) | |
| new(adjective, extraordinary, spare, fresh, special) | |
| no strings attached(expression, adjective, idiom, possible, voluntary) | |
| nonessential(adjective, casual, useless, extra, worthless) | |
| not compulsory(expression, idiom) | |
| not required(expression, adjective, useless, worthless, unwarranted) | |
| offered | |
| one more(expression, adjective, extraordinary, new, spare) | |
| opted(adjective, free, deliberate, natural, willing) | |
| optionally | |
| other(adjective, extraordinary, new, spare, fresh) | |
| over and above(expression, adjective, idiom, extraordinary, new) | |
| permissive | |
| planned | |
| plus(adjective, extraordinary, new, spare, fresh) | |
| premeditated | |
| proffered | |
| recommended | |
| redundant(adjective, extraordinary, new, spare, fresh) |
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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> |