(n.) A person affected with kleptomania.

amoral artful bent brigandish burglarious calculating chiseling collusive conscienceless corrupt corrupted counterfeit covinous crafty criminal crooked cunning dark deceitful deceptive devious dishonest dishonorable double-dealing doubtful dubious duplicitous evasive fake FALSE falsehearted falsified felonious finagling fishy forged furtive guileful ill-got ill-gotten imitation immoral indirect insidious kleptomaniac larcenous light-fingered not kosher pinchbeck piratelike piratic questionable rotten scheming shady sham shameless sharp shifty sinister slippery sneaky spurious sticky-fingered surreptitious suspicious thieving thievish treacherous trickish tricky two-faced unconscienced unconscientious unconscionable underhand underhanded unethical unprincipled unsavory unscrupulous unstraightforward wily without remorse without shame