involuntary
1. [ adjective ] not subject to the control of the will
Synonyms: unvoluntary nonvoluntary
Examples:

"involuntary manslaughter" "involuntary servitude" "an involuntary shudder" "It (becoming a hero) was involuntary. They sank my boat"- John F.Kennedy

Related terms: voluntary driven unconscious forced unwilled unwilling unconscious unwilling
2. [ adjective ] (physiology) controlled by the autonomic nervous system; without conscious control
Examples:

"involuntary muscles" "gave an involuntary start"

Related terms: voluntary physiology autonomic automatic vegetative
Similar spelling:   involuntarily
  influent
  involucre
  influenza
  involution
  involucrate
  involvement
  involute
  influence