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voluntary
adjective
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How to pronounce voluntary:

Definition of voluntary:

voluntary (adjective):
done or undertaken by free choice
proceeding from the will or from one's own choice or consent
of your own free will or design; done by choice; not forced or compelled.

Synonyms for voluntary:

optionalspontaneousstudiedwillingelectiveconsciousplannedvolunteerdeliberatediscretionary
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Antonyms for voluntary:

paidprofessionalrepaid

Other 4-syllable words like voluntary

Here are some other common words that have 4 syllables, like voluntary does.

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