假冒偽劣

假冒伪劣
jiǎmàowěiliè
  1. cheap quality counterfeit (goods)
  2. low-quality commodities

CEDICT

fake, forged, counterfeit and poor-quality; counterfeit and shoddy (generally speaking)

Wiktionary

Entry Composition

1 假冒 jiǎmào
  1. to impersonate
  2. to pose as (someone else)
  3. to counterfeit
  4. to palm off (a fake as a genuine)
2 偽劣 wěiliè
  1. inferior
  2. false