1. without conscious control or intention; done against one's will

Examples

• She shivered involuntarily when she heard the scary story.
• His eye twitched involuntarily during the stressful meeting.
• The patient was involuntarily committed to the psychiatric hospital.
• He found himself involuntarily holding his breath during the suspenseful scene.
• The muscle contracted involuntarily after the injury.
• She involuntarily stepped back when the dog barked loudly.