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Adjective: unvoluntary  ,ún'vó-lun,te-ree [N. Amer], ,ún'vó-lun-t(u-)ree [Brit]
Usage: rare (=involuntary)
  1. Not subject to the control of the will
    "Breathing is an unvoluntary action controlled by the autonomic nervous system";
    - involuntary, nonvoluntary

See also: driven, forced, goaded, unconscious, unwilled, unwilling