Without intention; unintentional. / Not voluntary or willing; contrary or opposed to explicit will or desire; unwilling.

The state of being involuntary; unwillingness; automatism.

(anatomy) Muscle that is not controlled by individual volition; cardiac muscle and smooth muscle.

Unlawful killing of a human being without malice aforethought, either express or implied, with the absence of intention.

plural of involuntary muscle

plural of involuntary manslaughter

A previously inhabited area that has been abandoned and allowed to return to a wild, overgrown state.

plural of involuntary park