Existential Disquiet is a term used to describe a feeling of anxiety or unease caused by the awareness of one's own mortality and the meaninglessness of life. It is often associated with the philosophical movement of Existentialism, which emphasizes the individual's freedom and responsibility in making choices and facing the consequences. The term ANGST is often used as a synonym for Existential Disquiet, as it is a German word that describes a feeling of fear, worry, or anxiety.