fatigue
UK: fəˈtiːɡ | US: fəˈtiːɡ
n. extreme tiredness resulting from mental or physical exertion
vt. to cause someone to feel exhausted
n. (engineering) weakening of material under repeated stress
The word "fatigue" traces back to Latin fatigare (to tire, harass), which evolved into Old French fatigue (weariness). The Latin root fatigare may derive from fatis (a term for exhaustion, possibly linked to fatuus "foolish," implying mental drain). The French suffix -igue was later dropped in English, but the morpheme boundary remains visible. The engineering sense (18th century) metaphorically extends the concept of human exhaustion to materials under stress.
After the marathon, she collapsed from sheer fatigue.
The soldiers were fatigued after days of marching.
Metal fatigue caused the bridge to fail prematurely.
Chronic fatigue syndrome can severely impact daily life.
The repetitive task fatigued his mind and body.