1. mischievous(s = adj.all) arch, impish, implike, pixilated, prankish, puckish, wicked - naughtily or annoyingly playful; "teasing and worrying with impish laughter"; "a wicked prank"
Derived form noun mischievousness2
2. mischievous(s = adj.all) - deliberately causing harm or damage; "mischievous rumors and falsehoods"
Derived forms noun mischief1, noun mischief2, noun mischievousness3
Causing mischief; harmful; hurtful; -- now often applied where the evil is done carelessly or in sport; as, a mischievous child. Shak. [1913 Webster]
"This false, wily, doubling disposition is intolerably mischievous to society." [1913 Webster]
mischievous, adj.
1 (of a person) disposed to mischief.
2 (of conduct) playfully malicious.
3 (of a thing) having harmful effects.
Derivative:
mischievously adv. mischievousness n.
Etymology:
ME f. AF meschevous f. OF meschever: see MISCHIEF
N badness, hurtfulness, virulence, evil doer, bane, plague spot, evil star, ill wind, hoodoo, Jonah, snake in the grass, skeleton in the closet, amari aliquid, thorn in the side, malignity, malevolence, tender mercies, ill-treatment, annoyance, molestation, abuse, oppression, persecution, outrage, misusage, injury, knockout drops, badness, peccancy, abomination, painfulness, pestilence, guilt, depravity, hurtful, harmful, scathful, baneful, baleful, injurious, deleterious, detrimental, noxious, pernicious, mischievous, full of mischief, mischief-making, malefic, malignant, nocuous, noisome, prejudicial, disserviceable, disadvantageous, wide-wasting, unlucky, sinister, obnoxious, untoward, disastrous, oppressive, burdensome, onerous, malign, corrupting &c (corrupt), virulent, venomous, envenomed, corrosive, poisonous, deadly, destructive, inauspicious, bad, ill, arrant, as bad as bad can be, dreadful, horrid, horrible, dire, rank, peccant, foul, fulsome, rotten, rotten at the core, vile, base, villainous, mean, injured, deteriorated, unsatisfactory, exceptionable indifferent, below par, illcontrived, ill-conditioned, wretched, sad, grievous, deplorable, lamentable, pitiful, pitiable, woeful, evil, wrong, depraved, shocking, reprehensible, hateful, hateful as a toad, abominable, detestable, execrable, cursed, accursed, confounded, damned, damnable, infernal, diabolic, unadvisable, unprofitable, incompetent, irremediable, badly, wrong, ill, to one's cost, where the shoe pinches, bad is the best: the worst come to the worst, herba mala presto cresco, wrongs unredressed or insults unavenged.