derealization
A psychological term describing a feeling that the external world is unreal or distorted. Often discussed in clinical contexts.
Derealization is one of the symptoms of dissociative disorders.
Under severe stress, one may experience derealization.
離人症 (depersonalization disorder) focuses on feeling detached from oneself, while 現実感喪失 is about the external world feeling unreal.
Compound of 現実感 (sense of reality) and 喪失 (loss). The term is a direct translation of the English 'derealization' used in psychology.