人心難測 rén xīn nán cè

DEFINITIONS

  1. hard to fathom a person's mind (idiom)

CHARACTERS

人 rén
HSK 1
man; people; mankind; someone else
心 xīn
HSK 3
heart; mind, intelligence; soul
難 nán difficult, arduous, hard; unable
測 cè measure, estimate, conjecture