Mischievous /(mĭs"chē̇*vŭs)/

Mis·chie·vous

Mischievous

a.
  1. Causing mischief; harmful; hurtful; -- now often applied where the evil is done carelessly or in sport; as, a mischievous child.
    This false, wily, doubling disposition is intolerably mischievous to society.