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Fiendish
Meaning
Adj
●
Sinister;
evil
; like a fiend.
●
Very difficult.
Sourced from
Wiktionary
Related
Devilish
Demonic
Dastardly
Malevolent
Bestial
Sinister
Diabolical
Cunning
Fearsome
Mischievous
Villainous
Eldritch
Ghoulish
Vampiric
Maniacal
Frightful
Treacherous
Insidious
Monstrous
Murderous
Machiavellian
Diabolic
Mysterious
Devious
Wily
Beguiling
Draconic
Grotesque
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