Acedia, from a Greek word meaning lack of care, is the most oppressive of the thoughts in Evagrius’s list. It makes the hours drag, turns the monk’s thoughts to other places and people, and urges him to leave. Its remedy is perseverance and tears. Later it was folded into the sin of sloth.
Acedia
The noonday demon: a spiritual listlessness and restlessness that tempts the monk to abandon his cell.
Also: accidie, sloth