Existential Despair

noun a state of listlessness or torpor, of not caring or not being concerned with one's position or condition in the world

• The monk struggled with acedia, a spiritual apathy that hindered his devotion to prayer.
• I've been feeling a bit of acedia lately, just not motivated to do much of anything.
• I can't shake off this feeling of acedia, it's like a constant cloud hanging over me.
• Acedia is like a heavy weight on your shoulders, dragging you down and sapping your energy.

noun a state of apathy or laziness, especially with regard to one's duties or responsibilities

• Accidia is a term used in medieval theology to describe a state of spiritual apathy or laziness.
• Accidia is like feeling too lazy to even get out of bed in the morning.
• I can't deal with your accidia right now, get up and do something productive!
• Accidia can be a roadblock on the path to success, hindering progress and motivation.