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involuntary (adj.)

mid-15c., from Late Latin involuntarius "involuntary, unwilling," from in- "not, opposite of" (see in- (1)) + Latin voluntarius "willing, voluntarily" (see voluntary). Related: Involuntarily.

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Definitions of involuntary from WordNet

involuntary (adj.)
not subject to the control of the will; "It (becoming a hero) was involuntary. They sank my boat"- John F.Kennedy;
an involuntary shudder
involuntary manslaughter
involuntary servitude
Synonyms: nonvoluntary / unvoluntary
involuntary (adj.)
controlled by the autonomic nervous system; without conscious control;
involuntary muscles
gave an involuntary start
From wordnet.princeton.edu