20 entries under adjective topic. ×

3
obligatory(adverb, unintentionally, optionally)
1
restrictive
0
binding
0
burning
0
central
0
compulsory
0
consequential
0
critical
0
crucial
0
essential
0
imperative
0
imperious
0
inevitable
0
involuntary
0
main
0
mandatory
0
necessary
0
needed
0
unavoidable
0
vital
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APASmart Define. (2015). voluntarily thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/voluntarily/thesaurus/antonyms
ChicagoSmart Define. 2015. "voluntarily thesaurus" https://smartdefine.org/voluntarily/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, voluntarily thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/voluntarily/thesaurus/antonyms>.
MLASmart Define. "voluntarily thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/voluntarily/thesaurus/antonyms>