mischievous

mischievous
    adj 1: naughtily or annoyingly playful; "teasing and worrying
           with impish laughter"; "a wicked prank" [syn: {arch},
           {impish}, {implike}, {mischievous}, {pixilated},
           {prankish}, {puckish}, {wicked}]
    2: deliberately causing harm or damage; "mischievous rumors and
       falsehoods"
    

Mischievous \Mis"chie*vous\ (m[i^]s"ch[-e]*v[u^]s), a.
   Causing mischief; harmful; hurtful; -- now often applied
   where the evil is done carelessly or in sport; as, a
   mischievous child. "Most mischievous foul sin." --Shak.
   [1913 Webster]

         This false, wily, doubling disposition is intolerably
         mischievous to society.                  --South.
   [1913 Webster]

   Syn: Harmful; hurtful; detrimental; noxious; pernicious;
        destructive.
        [1913 Webster] -- {Mis"chie*vous*ly}, adv. --
        {Mis"chie*vous*ness}, n.
        [1913 Webster]
    

89 Moby Thesaurus words for "mischievous":
      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