Boredom and Sloth
Habitual boredom, boredom not just with a specific task like chopping wood for ten hours a day but boredom that is like the sky spread over everything, not only leads to sin, but it is in itself a sin. The medievals called it sloth (acedia or akedia), one of the seven deadly sins.
Sloth is not simply laziness. In fact, it does not necessarily imply any physical laziness at all. It means the passivity and inactivity of the will and the passions even in the presence of the true good. In other word, it is the soul’s refusal to eat its food. As violence is spiritual junk food, boredom is spiritual anorexia.