| involuntary(adjective, intentional, automatic) | |
| unwilling(adjective, involuntary) | |
| compulsory(adjective, binding) | |
| forced(verb, adjective, involuntary) | |
| unintentional | |
| obligatory(adjective, essential, required, involuntary, optional) | |
| unconscious | |
| draftee | |
| necessary(adjective, unimportant, trivial, inevitable) | |
| automatic | |
| instinctive | |
| mandatory(adjective, necessary, required) | |
| accidental | |
| counteractive | |
| inadvertent | |
| reflex | |
| required | |
| spontaneous | |
| unpremeditated | |
| imperative(adjective, necessary, authoritative) |
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| APA | Smart Define. (2015). voluntary thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/voluntary/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "voluntary thesaurus" https://smartdefine.org/voluntary/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, voluntary thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/voluntary/thesaurus/antonyms>. |
| MLA | Smart Define. "voluntary thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/voluntary/thesaurus/antonyms> |