fatigue

n.

  1. Weariness from bodily labor or mental exertion; lassitude or exhaustion of strength.
  2. The cause of weariness; labor; toil; as, the fatigues of war.
  3. The weakening of a metal when subjected to repeated vibrations or strains.
  4. To weary with labor or any bodily or mental exertion; to harass with toil; to exhaust the strength or endurance of; to tire.