丹精

Etymology
From tan (丹, wholeheartedly, sincerely, devotedly) + sei (精, meticulous, careful, elaborate).

Noun

 * 1) great care
 * 2) working earnestly
 * 3) sincerity
 * 4) diligence
 * 5) efforts, pains, labor

Verb

 * 1) exert oneself