苦心 [ㄎㄨˇ ㄒㄧㄣ; ku3 xin1] painstaking effort to take a lot of trouble laborious at pains ◄ ►
苦心 くしん noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru pain trouble anxiety diligence hard work ◄ ►