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