(ˈ)in, ən+ adjective
Etymology: Late Latin involuntarius, from Latin in- in- (I) + voluntarius voluntary
1.
a. : springing from accident or impulse rather than conscious exercise of the will : unintentional , spontaneous
an involuntary inheritance from her rich and backward husband — Nigel Dennis
concentration became at first effortless, then involuntary , then necessitous — Charles Morgan
b. : dictated by authority or circumstance : compulsory
involuntary servitude
involuntary unemployment
c. of bankruptcy : declared upon petition of creditors
2. : not subject to control of the will : independent of volition : reflex
involuntary contraction
involuntary weeping