amoral conscienceless corrupt corrupted criminal crooked dark devious dishonest dishonorable doubtful dubious evasive felonious fishy fraudulent ill-got ill-gotten immoral indirect insidious mercenary not kosher questionable rotten shady shameless shifty sinister slippery suspicious tricky unconscienced unconscientious unconscionable underhand underhanded unprincipled unsavory unscrupulous unstraightforward venal without remorse without shame