Mischievous

Part of speech: adjective (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. This false, wily, doubling disposition is intolerably mischievous to society. South.

Synonyms: Harmful; hurtful; detrimental; noxious; pernicious; destructive. Mis"chie*vous*ly, adv. Mis"chie*vous*ness, n.