1. a state of extreme physical or mental tiredness
2. the action of using something up completely

Examples

• After running the marathon, she collapsed from exhaustion.
• The long work week left him in a state of complete exhaustion.
• The exhaustion of natural resources is a growing concern.
• Mental exhaustion can be just as debilitating as physical fatigue.
• The exhaustion of the oil reserves forced the company to explore new areas.
• She needed a vacation to recover from her exhaustion.
• The exhaustion of all options led them to seek help elsewhere.