Synonyms and related words :
annoying, arch, artful, bad, baleful, baneful, bothering, bothersome, corroding, corrosive, corrupting, corruptive, counterproductive, damaging, dangerous, deadly, deleterious, destructive, detrimental, devilish, disadvantageous, disserviceable, distressing, elfish, elvish, evil, foolish, foxy, frolicsome, full of mischief, harmful, hazardous, high-spirited, hurtful, ill, ill-behaved, impish, injurious, insidious, irking, irksome, knavish, larkish, lethal, malefic, malevolent, malicious, malign, malignant, misbehaving, mischief-loving, naughty, noisome, noxious, ominous, paw, perilous, pernicious, playful, poisonous, prankish, pranksome, pranky, precarious, prejudicial, puckish, rascally, risky, roguish, scampish, scapegrace, scatheful, sly, spiteful, sportive, toxic, trickish, tricksy, tricky, venenate, veneniferous, venenous, venomous, vexatious, vexing, vicious, virulent, waggish, wicked