空洞无物

空洞無物
kōngdòngwúwù
  1. empty cave, nothing there (idiom); devoid of substance
  2. nothing new to show

CEDICT

utter lack of substance; devoid of content

Wiktionary

Entry Composition

1 空洞 kōngdòng
  1. cavity
  2. empty
  3. vacuous
2 无物 wúwù
  1. nothing
  2. empty