殚
精
竭
虑

Word Definition - 殚精竭虑

dān jīng jié lǜ to exhaust one's thoughts and ingenuity (idiom); to think sth through thoroughly; to rack one's brains; to leave no stone unturned

Individual Character Details

殚 dān
精 jīng
竭 jié
虑 lǜ