1. (a.) Like or characteristic of a knave; given to knavery; trickish; fraudulent; dishonest; villainous; as, a knavish fellow, or a knavish trick.

2. (a.) Mischievous; roguish; waggish.

abominable arch arrant atrocious bad base black blackguardly blamable blameworthy criminal damnable dark deceitful degraded devilish disgraceful elfish elvish evil execrable flagitious flagrant foolish foul full of mischief heinous high-spirited impish improper infamous iniquitous low lying mendacious mischief-loving mischievous monstrous naughty nefarious notorious peccant playful prankish pranksome pranky puckish rank rascally recreant reprehensible reprobate roguish scampish scandalous scapegrace scoundrelly shameful shifty sinful sportive trickish tricksy unforgivable unpardonable unspeakable untruthful unworthy vicious vile villainous waggish wicked wrong