n. temporary loss of strength and energy resulting from hard physical or mental work
n. used of materials (especially metals) in a weakened state caused by long stress
n. (always used with a modifier) boredom resulting from overexposure to something
n. 疲乏, 疲劳
vt. 使疲劳, 使心智衰弱
vi. 疲劳
a. 疲劳的