殫ㄉㄢdān精ㄐㄧㄥjīng竭ㄐㄧㄝˊjié慮ㄌㄩˋlǜ

  1. 竭盡精力與思慮。《清史稿·卷四八二·儒林傳三·陳奐傳》：「奐嘗言大毛公詁訓傳言簡意賅，遂殫精竭慮，專攻毛傳。」也作「殫心竭慮」、「殫思極慮」。似殫智竭力、殫思極慮、竭盡心思反掉以輕心

英to exhaust one's thoughts and ingenuity (idiom)​; to think sth through thoroughly, to rack one's brains, to leave no stone unturned
法concentrer toute son attention, déployer toutes les forces de son esprit
德sich den Kopf zerbrechen (S)​