WordWeb Online

1. Capable of being corrupted
   "dishonest politicians";
   - corruptible, bribable, purchasable, venal
    
2. Deceptive or fraudulent; disposed to cheat or defraud or deceive
   - dishonorable [US], dishonourable [Brit, Cdn]

See also: ambidextrous, beguiling, bent [Brit, informal], blackguardly, corrupt, crooked [informal], deceitful, deceptive, dishonorable [US], dishonourable [Brit, Cdn], double-dealing, double-faced, double-tongued, duplicitous, fallacious, false, fraudulent, furacious [archaic], insincere, Janus-faced, misleading, picaresque, rascally, roguish, scoundrelly, thieving, thievish, two-faced, untrustworthy, untrusty

Encyclopedia: Dishonest