death instinct

noun

1. suicidal tendency or inclination; predisposition to self-destruction.
2. Psychoanalysis. an impulse to withdraw or destroy, working in opposition to forces urging survival and creation (life instinct).

n.

1. A primitive impulse for destruction, decay, and death, manifested by a turning away from pleasure, postulated by Sigmund Freud as coexisting with and opposing the life instinct.Thanatos