Involuntary definition

ĭn-vŏlən-tĕrē
Acting or done without or against one's will.

An involuntary participant in what turned out to be an argument.

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Acting or done without or against one's will.

An involuntary participant in what turned out to be an argument.

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Not under conscious control. Most of the biological processes in animals that are vital to life, such as contraction of the heart, blood flow, breathing, and digestion, are involuntary and controlled by the autonomic nervous system.
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He involuntarily overheard the conversation.

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The definition of involuntary is done not by choice, or something done by accident or automatically.

An example of something involuntary is blinking; an involuntary action.

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Performed against one’s will.
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Not voluntary or willing; contrary or opposed to explicit will or desire; unwilling.

He found himself the involuntary witness in the trial.

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Not voluntary.
  • Not done of one's own free will; not done by choice.
  • Unintentional; accidental.
  • Not consciously controlled; automatic.
    Sneezing is involuntary.
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Not subject to control of the volition.

Gave an involuntary start.

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Not subject to control of the volition.

Gave an involuntary start.

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Origin of involuntary

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

    From Wiktionary