艰深晦涩 jiān shēn huì sè

DEFINITIONS

  1. abstruse and unfathomable (idiom)

CHARACTERS

艰 jiān
HSK 5
difficult, hard; distressing
深 shēn
HSK 4
deep; depth; far; very, extreme
晦 huì dark, unclear, obscure; night
涩 sè
HSK 6
astringent; harsh; uneven, rough