Once he had grasped the controls, he unleashed a demonic laugh that made his hostages shudder.
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"
Demonic means coming from or belonging to a demon or being like a demon. demonic forces. a demonic grin