殚精竭虑

殫精竭慮
dānjīngjiélǜ
  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

CEDICT

to exhaust one's energy and rack one's brain

Wiktionary

竭尽精力与思虑。《清史稿．卷四八二．儒林传三．陈奂传》：「奂尝言大毛公诂训传言简意赅，遂殚精竭虑，专攻毛传。」也作「殚心竭虑」、「殚思极虑」。

重編國語辭典

殚：竭尽；虑：思虑。形容用尽心思。

維基詞典

Entry Composition

1 殚 dān
  1. entirely
  2. to exhaust
2 精 jīng
  1. essence
  2. extract
  3. vitality
  4. energy
  5. semen
  6. sperm
  7. mythical goblin spirit
  8. highly perfected
  9. elite
  10. the pick of sth
  11. proficient (refined ability)
  12. extremely (fine)
  13. selected rice (archaic)
3 竭虑 jiélǜ
  1. (literary) to ponder deeply; to meditate on; to ruminate on; to muse on
  2. to ponder deeply; to meditate on; to ruminate on; to muse on

Related entries

殚精极虑 dānjīngjílǜ
  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
劳心苦思 láoxīnkǔsī
  1. to rack one's brains
  2. to think hard
搜索枯肠 sōusuǒkūcháng to rack one's brains (for apt wording etc) (idiom)
绞尽脑汁 jiǎojìnnǎozhī to rack one's brains
绞脑汁 jiǎonǎozhī to rack one's brains
冥思苦想 míngsīkǔxiǎng
  1. to consider from all angles (idiom); to think hard
  2. to rack one's brains
劳心 láoxīn
  1. to work with one's brains
  2. to rack one's brains
  3. to worry
挖空心思 wākōngxīnsi
  1. to dig for thoughts (idiom); to search everything for an answer
  2. to rack one's brains
倾箱倒箧 qīngxiāngdàoqiè
  1. (idiom) to exhaust all one has
  2. to leave no stone unturned
  3. to try one's best