Compounds of 閉口

• 閉口
  (n,vs,adj-no) (1) dumbfounded
  stumped
  at one's wits end
  nonplussed
  (2) annoyed
  (P)
• 閉口頓首
  (n,vs) being at a complete loss as to what to do
  being at one's wit's end
  being at a loss for an answer