挠头

Traditional form:

撓頭

Pinyin (reading):

náotóu

Definitions:

• tricky
• problematic
• difficult
• to scratch one's head (in puzzlement)

Characters:

• 挠 - to yield; to scratch, to disturb
• 头 - head; chief, boss; first, top

Traditional characters:

• 撓 - to yield; to scratch, to disturb
• 頭 - head; chief, boss; first, top