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