kong1
dong4
wu2
wu4
  1. empty cave, nothing there (idiom); devoid of substance
  2. nothing new to show

Characters

  • 空 (空): empty; air; sky; in vain
  • 洞 (洞): cave; hole; zero (unambiguous spoken form when spelling out numbers); CL:個|个[ge4]
  • 无 (無): not to have; no; none; not; to lack; un-; -less
  • 物 (物): (bound form) thing; (literary) the outside world as distinct from oneself; people other than oneself

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