Copied from something else and usually not as good as the original
Being a usually artificial and inferior substitution or imitation (ersatz intellectuals)
1) He lived in an apartment complex designed as an ersatz Mediterranean villa.
2) Like everything else the restaurant served, the whipped cream on the dessert was ersatz.
From German ersatz which means 'substitute'.
artificial, bogus, imitation, dummy, factitious, fake, false, mimic, mock, pretend, faux, shan, simulated, substitute, synthetic
genuine, natural, real, original, actual, authentic, certified, echt