1. mistaken, incorrect, wrong, untrue. 2. untruthful, lying, mendacious. 3. insincere, hypocritical, disingenuous, disloyal, unfaithful, inconstant, perfidious, traitorous. 4. misleading, fallacious. 5. artificial, spurious, bogus, forged. False, sham, counterfeit agree in referring to something that is not genuine. False is used mainly of imitations of concrete objects; it sometimes implies an intent to deceive: false teeth; false hair. Sham is rarely used of concrete objects and usually has the suggestion of intent to deceive: sham title; sham tears. Counterfeit always has the implication of cheating; it is used particularly of spurious imitation of coins, paper money, etc.