| opted(adjective, free, deliberate, natural, willing) | |
| optional(adjective, free, deliberate, natural, willing) | |
| pro bono(expression, voluntary) | |
| proletarian | |
| redeemable | |
| remaining(adjective, outstanding, unsettled, unresolved, owing) | |
| rent-free | |
| royal(adjective, characteristic) | |
| shaken | |
| unbidden(adjective, free, deliberate, natural, willing) | |
| unbought | |
| uncompelled(adjective, free, deliberate, natural, willing) | |
| undefrayed(adjective, outstanding, unsettled, settled, taken) | |
| undischarged | |
| unindemnified(adjective, free, voluntary, honorary, unrewarded) | |
| unliquidated(adjective, outstanding, unsettled, settled, taken) | |
| unprescribed(adjective, free, deliberate, natural, willing) | |
| unprofessional | |
| what is owing(expression, idiom) | |
| willful(adjective, free, deliberate, natural, willing) |
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| APA | Smart Define. (2015). unpaid thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unpaid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unpaid thesaurus" https://smartdefine.org/unpaid/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, unpaid thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unpaid/thesaurus/synonyms>. |
| MLA | Smart Define. "unpaid thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/unpaid/thesaurus/synonyms> |