苦心 kǔ xīn 🔊 painstaking effort HSK 7–9 + Review this word Meanings kǔ xīn painstaking effortto take a lot of troublelaborious at pains Its characters 苦kǔbitterHSK 4心xīnheartHSK 4 Words with 苦心 苦心经营 kǔ xīn jīng yíng to build up an enterprise through… 煞费苦心 shà fèi kǔ xīn to take a lot of trouble (idiom) 苦心孤诣 kǔ xīn gū yì to make painstaking efforts (idiom)