Malicious

a.
  1. Indulging or exercising malice; harboring ill will or enmity.
  2. Proceeding from hatred or ill will; dictated by malice; as, a malicious report; malicious mischief.
  3. (Law) With wicked or mischievous intentions or motives; wrongful and done intentionally without just cause or excuse; as, a malicious act.
  4. Malicious abandonment ,
    the desertion of a wife or husband without just cause.
    Malicious prosecution or Malicious arrest (Law),
    a wanton prosecution or arrest, by regular process in a civil or criminal proceeding, without probable cause.