counterfeit

Short definition from Wiktionary

Adjective

1. 1
   False, especially of money; intended to deceive or carry appearance of being genuine.
2. 2
   Inauthentic.
3. 3
   Assuming the appearance of something; deceitful; hypocritical.

Noun

1. 1
   A non-genuine article; a fake.
2. 2
   One who counterfeits; a counterfeiter.
3. 3
   That which resembles another thing; a likeness; a portrait; a counterpart.
4. 4
   An impostor; a cheat.

Verb

1. 1
   To falsely produce what appears to be official or valid; to produce a forged copy of.
2. 2
   To produce a faithful copy of.
3. 3
   To feign; to mimic.
4. 4
   Of a turn or river card, to invalidate a player's hand by making a better hand on the board.