54 entries under free topic. ×
| cost-free | |
| costless(willing, gratis) | |
| extra(adjective, open, elective) | |
| for nothing(expression, gratis) | |
| free of charge(expression, idiom, gratis) | |
| no strings attached(expression, idiom, open, elective) | |
| noncompulsory(adjective, open, elective) | |
| not required(expression, open, elective) | |
| on the house(expression, idiom, gratis) | |
| open | |
| toll-free | |
| unasked-for(willing, gratis) | |
| unrestricted(open, elective) | |
| up to the individual(expression, idiom, open, elective) |
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Voluntary on
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| APA | Smart Define. (2015). voluntary thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/voluntary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "voluntary thesaurus" https://smartdefine.org/voluntary/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, voluntary thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/voluntary/thesaurus/synonyms>. |
| MLA | Smart Define. "voluntary thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/voluntary/thesaurus/synonyms> |