counterfeit 主要是指偽造，[例句]Are you aware these notes are counterfeit?
妳覺察到這些鈔票是偽造的嗎？fake 指偽造、假裝、冒充、篡改等意思。[例句]Fake designer watches are sold at a fraction of the price of the genuine article.
偽造的設計師名牌手表以真品若幹分之壹的價格出售。shoddy是指劣質的、做工粗糙的。[例句]I'm normally quick to complain about shoddy service
對劣質服務我通常會立刻投訴。copycat是盲目模仿者的意思，[例句]The Beatles have copycats all over the world. 披頭士樂隊的模仿者遍布全世界。