Hopelessness

An unpleasant emotion arising from the belief that one has no solution to serious life problems, often viewing suicide as the only way out of an intolerable situation. Hopelessness is often seen as a core characteristic of depression and serves as a link between depression and suicide.

Reference:
Beck, A. T., & Steer, R. A. (1985). Hopelessness and Eventual Suicide: A 10-Year Prospective Study of Patients Hospitalized With Suicidal Ideation. American Journal of Psychiatry, 142(5), 559-563.