fatigue

noun

• 1extreme tiredness, typically resulting from mental or physical exertion or illness:he was nearly dead with fatigue
• a reduction in the efficiency of a muscle or organ after prolonged activity.
• weakness in materials, especially metal, caused by repeated variations of stress:metal fatigue
• [with modifier] a lessening in one’s response to or enthusiasm for something, typically as a result of overexposure to it:museum fatigue

• 2 (also fatigue detail) a group of soldiers ordered to perform menial, nonmilitary tasks, sometimes as a punishment.
• (fatigues) loose-fitting clothing, typically khaki, olive drab, or camouflaged, worn by soldiers:battle fatigues

verb (fatigues, fatiguing, fatigued)

• cause (someone) to feel tired or exhausted:they were fatigued by their journey
• reduce the efficiency of (a muscle or organ) by prolonged activity.
• weaken (a material, especially metal) by repeated variations of stress.