Merriam-Webster Collegiate Dictionary - counterfeit

 I. adjective  Etymology: Middle English countrefet, from Anglo-French cuntrefeit, from past participle of cuntrefere, contrefaire to imitate, from cuntre- + faire to make, from Latin facere — more at do  Date: 14th century  1. made in imitation of something else with intent to deceive ; forged ~ money  2.  a. insincere, feigned ~ sympathy  b. imitation ~ Georgian houses  II. verb  Date: 14th century  transitive verb to imitate or feign especially with intent to deceive; also to make a fraudulent replica of ~ing $20 bills  intransitive verb  1. to try to deceive by pretense or dissembling  2. to engage in ~ing something of value  Synonyms: see assume  • ~er noun  III. noun  Date: 15th century  1. something ~ ; forgery  2. something likely to be mistaken for something of higher value pity was a ~ of love — Harry Hervey  Synonyms: see imposture