\ AIR-sahts; UR-sats \ , adjective;
1.Being a substitute or imitation, usually an inferior one.
This is an exceptional word. I like the ‘usually an inferior one’ part. I believe someone appears ersatz when they attempt what someone has already done. For example, the Twix “pause” commercials that were not very funny, are now being imitated by McDonalds, and it’s less funny. I’m not lovin’ it.