fiendish Meaning, Definition & Usage

  1. adjective satellite extremely evil or cruel; expressive of cruelty or befitting hell
    satanic; infernal; demonic; hellish; unholy; diabolical; diabolic.
    • 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

WordNet


Fiend"ish adjective
Definitions
  1. Like a fiend; diabolically wicked or cruel; infernal; malignant; devilish; hellish. -- Fiend"ish*ly, adv. -- Fiend"ish*ness, n.

Webster 1913