exhaustion

/ɪɡˈzɔːstʃən/
noun
  1. The state of being extremely tired, physically or mentally.
    • After working 12 hours straight, she collapsed from exhaustion.
    • Heat exhaustion can be dangerous if not treated quickly.
    • Mental exhaustion made it impossible for him to study anymore.
  2. The act of using up a supply or resource completely.
    • Overfishing led to the exhaustion of fish populations in the lake.
    • The rapid exhaustion of our funds meant we had to cancel the project.
    • The exhaustion of the oil reserves forced the country to import more.