Fiendish

ahd-5
  • adjective. Of, relating to, or suggestive of a fiend; diabolical.
  • adjective. Extremely wicked or cruel.
  • adjective. Extremely bad, disagreeable, or difficult.
    • The Century Dictionary and Cyclopedia
  • Having the qualities of a fiend; characteristic of a fiend; demoniacal; extremely wicked, cruel, or malicious; devilish: as, a fiendish persecutor; fiendish laughter.
    • the GNU version of the Collaborative International Dictionary of English
  • adjective. Like a fiend; diabolically wicked or cruel; infernal; malignant; devilish; hellish.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • adjective. Sinister; evil; conniving; in the manner of a fiend.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • adjective. extremely evil or cruel; expressive of cruelty or befitting hell
    • Word Usage
    "It was a high-pitched laugh and if a sound ever deserved to be called fiendish that one did."
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