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Independent of or contrary to the will. involuntary, adj performed independently of the will. involuntary. performed independently of the will. see culling. includes convulsions and tremor and intermittent contractions of large muscle masses which result in movement of individual limbs or other parts of the body.
Cardiac muscle (Involuntary) Voluntary muscles are those that you can conciously control; for example your biceps. Involuntary muscles are controlled by your subconscious and you have no control over them such as your esophagus or stomache (smooth muscle) or your heart (cardiac muscle) Source: Modern Biology by Holt.