adjective

(of a product) made or used as a substitute, typically an inferior one, for something else.

ersatz coffee

artificial,substitute,imitation,synthetic,fake,false,faux,mock,simulated,pseudo,sham,bogus,spurious,counterfeit,forged,pretended,so-called,plastic,manufactured,man-made,unnatural,fabricated,replica,reproduction,facsimile,inferior,low-quality,poor-quality,low-grade,shoddy,substandard,unsatisfactory,adulterated,phoney,farkakte