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The Simple English Wikipedia has an article on:

Plain form
counterfeit

Third-person singular
counterfeits

Past tense
counterfeited

Past participle
counterfeited

Present participle
counterfeiting

 
A real Sharpie marker with a counterfeit right next to it.
  1. The past tense and past participle of counterfeit.
    This pen is counterfeited, it is an imitation.