Fatigue

temporary loss of strength and energy resulting from hard physical or mental work

used of materials (especially metals) in a weakened state caused by long stress

(always used with a modifier) boredom resulting from overexposure to something

labor of a nonmilitary kind done by soldiers (cleaning or digging or draining or so on)

lose interest or become bored with something or somebody

exhaust or get tired through overuse or great strain or stress