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In an involuntary manner; not voluntarily; not intentionally or willingly.

A nervous disease in which the patient involuntarily imitates the words or action of another.

e necessary intervention of consciousness. Reflex action (Physiol.), any action performed involuntarily in consequence of an impulse or impression transmitted along afferent nerves to a nerve center, from which it is reflected to an efferent nerve, and so calls into action certain muscles, organs, or cells. -- Reflex…

To shake involuntarily, as with fear, cold, or weakness; to quake; to quiver; to shiver; to shudder; -- said of a person or an animal. I tremble still with fear. Shak. Frighted Turnus trembled as he spoke. Dryden.

To open the mouth involuntarily through drowsiness, dullness, or fatigue; to gape; to oscitate. "The lazy, yawning drone." Shak. And while above he spends his breath, The yawning audience nod beneath. Trumbull.