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Adjective: fiendish  feendish
  1. Extremely evil or cruel; expressive of cruelty or befitting hell
    "a fiendish despot"
    - demonic, diabolic, diabolical, hellish, infernal, satanic, unholy
     
  2. Very difficult
    "the puzzles are fiendish"

See also: evil, fiendishly

Encyclopedia: Fiendish

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fieldsman
fieldstone
field-test
fieldwork
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fiendish
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fierce
fiercely
fierceness
fieri facias
fierily
fieriness
fiery
fiesta
fiesta flower