- adj1. rascally, rascal, roguish, blackguardly, dastardly; mischievous, naughty, scampish, waggish; low, base, rotten, stinking, rank, dirty, contemptible, awful, terrible; villainous, nasty, mean, cruel, brutal.2. unscrupulous, dishonorable, unprincipled, unethical, reprobate, immoral, depraved, corrupt; dishonest, insincere, disingenuous, untruthful, lying, mendacious, hypocritical; deceitful, deceptive, delusive, misleading, dissembling, dissimulative, beguiling, Sl. double-crossing, Sl. two-timing; treacherous, sneaky, double-dealing, underhanded, cheating, crooked, tortuous; tricky, trickish, sly, shrewd, sharp, cunning, wily, foxy, artful, insidious, subtle, Archaic. tricksy; conniving, collusive, designing, scheming, plotting
A Note on the Style of the synonym finder. 2014.