(a.) Not scrupulous; unprincipled.

amoral artful conscienceless corrupt corrupted crafty criminal crooked cunning dark deceitful devious dishonest dishonorable disingenuous doubtful dubious evasive evil faithless FALSE felonious fishy fraudulent ill-got ill-gotten immoral improper inaccurate indirect inexact insidious knavish mercenary not kosher perfidious questionable roguish rotten scheming shady shameless shifty sinister slippery sly sneaky stick-at-nothing suspicious treacherous tricky unconscienced unconscientious unconscionable uncritical underhand underhanded unethical unexacting unfinical unfussy unmeticulous unpainstaking unparticular unprecise unprincipled unpunctilious unpunctual unrigorous unsavory unseemly unstraightforward untrustworthy venal wicked without remorse without shame wrongful