Word: 苦心 (kǔxīn) 苦心 dictionary entry kǔxīn painstaking effort; to take a lot of trouble; laborious at pains Full dictionary entry for 苦心 Example sentences using 苦心 2 sentences, showing page 1 of 1. 别辜负大家的一片苦心。 Bié gūfù dàjiā de yípiàn kǔxīn. Don't let down everyone's earnest efforts. 老师苦心安排了这次活动。 Lǎoshī kǔxīn ānpáile zhècì huódòng. The teacher went to great lengths to organize this activity.