fiendly

adjective
fiend·​ly | \ -dlē, -dli\
-er/-est

Definition of fiendly

archaic
: of, relating to, or befitting a fiend : fiendish

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History and Etymology for fiendly

Middle English feendly, fiendly, from Old English fēondlic, fīendlic, from fēond, fīend fiend + -lic -ly

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