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fiendish

fiend·ish

fiendish

pronunciation:
fin dihsh
part of speech: adjective
definition 1: of, pertaining to, or like a fiend; diabolical or extremely cruel.
similar words:
diabolic, diabolical, inhuman, satanic
definition 2: extremely difficult or troublesome; vexatious.
a fiendish puzzle
derivations: fiendishly (adv.), fiendishness (n.)