苦心
kǔxīn
painstakingly
Every meaning
kǔxīn
- painstakingly
- painstaking effort; trouble taken (as in 用心良苦)
Its characters
Words with 苦
Words with 心
Meanings are from Mandarin The Wild’s own dictionary. Levels follow the official HSK word list (the exam’s 2025 syllabus, levels 7–9 shown together).