Synonyms and related words :
amoral, conscienceless, corrupt, corrupted, criminal, crooked, dark, devious, dishonest, dishonorable, dissolute, doubtful, dubious, evasive, felonious, fishy, fraudulent, ill-got, ill-gotten, immoral, indirect, insidious, licentious, mercenary, not kosher, profligate, questionable, reprobate, rotten, shady, shameless, shifty, sinister, slippery, stick-at-nothing, suspicious, tricky, unconscienced, unconscientious, unconscionable, underhand, underhanded, unethical, unsavory, unscrupulous, unstraightforward, venal, without remorse, without shame