noun

1. The act of depersonalizing or the state of being depersonalized

   “He was in a critical state of depersonalization.”

2. The loss of one's sense of personal identity

   “His depersonalization causes a great deal of stress as he searches for an authentic personal identity.”

3. A feeling of being unreal, detached or unable to feel emotion

   “His severe depersonalization causes an aloof demeanor.”