苦心

Traditional form:

苦心

Pinyin (reading):

kǔxīn

Definitions:

• painstaking effort
• to take a lot of trouble
• laborious at pains

Characters:

• 苦 - bitter; hardship, suffering
• 心 - heart; mind; soul

Traditional characters:

• 苦 - bitter; hardship, suffering
• 心 - heart; mind; soul