1The patient's eyes fluttered involuntarily as she drifted in and out of consciousness.
2When he heard the news, he let out an involuntarily cry of despair.
3The muscles in her face contracted involuntarily as she tried to hold back tears.
4The driver's foot pressed the brake involuntarily as the car in front of him suddenly stopped.
5There is evidence to suggest that some of our most fundamental moral intuitions arise involuntarily, without the need for rational deliberation.