Involuntary Definition

ĭn-vŏlən-tĕrē
adjective
Acting or done without or against one's will.
An involuntary participant in what turned out to be an argument.
American Heritage Medicine
Not voluntary.
Webster's New World
Not subject to control of the volition.
Gave an involuntary start.
American Heritage Medicine
Performed against one’s will.
Webster's New World Law
He involuntarily overheard the conversation.
Wiktionary

Origin of Involuntary

  • From in- +‎ voluntary, from Late Latin involontarius, from in + volontarius.

    From Wiktionary

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