The DICT Development Group

  Demonic \De*mo"nic\, a. [L. daemonicus, Gr. daimoniko`s.]
     Of or pertaining to a demon or to demons; demoniac. "Demonic
     ambushes." --Lowell.
     [1913 Webster]

  demonic
      adj 1: extremely evil or cruel; expressive of cruelty or
             befitting hell; "something demonic in him--something that
             could be cruel"; "fires lit up a diabolic scene";
             "diabolical sorcerers under the influence of devils"; "a
             fiendish despot"; "hellish torture"; "infernal
             instruments of war"; "satanic cruelty"; "unholy grimaces"
             [syn: demonic, diabolic, diabolical, fiendish,
             hellish, infernal, satanic, unholy]