'Demonic' definitions:

Definition of 'demonic'

From: WordNet
adjective
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]

Definition of 'Demonic'

From: GCIDE
  • 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]