苦差kǔchāiMeanings1. hard task2. difficult mission3. arduous and unrewarding undertaking4. drudgery5. grind6. choreCharacters used苦bitter差differenceExamples1说服shuōfú他tā中止zhōngzhǐ旅行lǚxíng真是zhēnshi件jiàn苦差kǔchāi事shì。I had a hard time trying to persuade him to cancel the trip.