Thesaurus
volunteer
adjective
Synonyms and Antonyms of VOLUNTEER
done, made, or given with one's own free will <volunteer work at the hospital>
Related Words discretionary, elective, optional; impulsive, instinctive, spontaneous, unpremeditated; conscious, deliberate, intentional, knowing, willful (or wilful)
Near Antonyms compulsory, enforced, mandatory, necessary, nonelective, obligatory, ordered, required
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