忍俊不禁 rěn jùn bù jīn

DEFINITIONS

  1. cannot help laughing
  2. unable to restrain a smile

CHARACTERS

忍 rěn
HSK 5
endure, bear, suffer; forbear
俊 jùn
HSK 5
talented, capable; handsome
不 bù
HSK 1
no, not; un-; negative prefix
禁 jīn
HSK 4
restrict, prohibit, forbid