The Oxford Thesaurus An A-Z Dictionary of Synonyms - exhaustionn.

1) emptying, drawing out or forth, discharge, draining, evacuation, voiding, depletion, consumption, finish(ing) : The exhaustion of air from the cylinder is accomplished by a powerful pump. 2) tiredness, fatigue, enervation, debilitation, weariness, lassitude: The survivors were suffering from exposure and exhaustion.