疲

金属疲劳

jīn shǔ pí láo

metal fatigue

不知疲倦

bù zhī pí juàn

untiring

慢性疲劳症候群

màn xìng pí láo zhèng hòu qún

chronic fatigue syndrome (CFS)

乐此不疲

lè cǐ bù pí

to enjoy sth and never tire of it (idiom)

疲累

pí lèi

tired

疲软

pí ruǎn

tired and feeble

疲乏

pí fá

tired

疲倦

pí juàn

to tire

疲劳

pí láo

fatigue

疲劳症

pí láo zhèng

fatigue

疲匮

pí kuì

tired

疲困

pí kùn

(literary) tired