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殚精竭虑
殫精竭慮
dānjīngjiélǚ
1. to exhaust one's thoughts and ingenuity (idiom); to think sth through thoroughly
2. to rack one's brains
3. to leave no stone unturned

Character Breakdown

殚
dān
utmost, entirely, quite; to use up
12 丶
精
jīng
essence, germ, spirit
HSK 4 14 丶
竭
jié
to exhaust; to put forth great effort
HSK 6 14 丶
虑
lǜ
anxious, concerned, worried
HSK 4 10 丶

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Category
Chinese