Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of fiendish is as below...

Fiendful :: Fiendful (a.) Full of fiendish spirit or arts.

Fiendish :: Fiendish (a.) Like a fiend; diabolically wicked or cruel; infernal; malignant; devilish; hellish.

Fiendlike :: Fiendlike (a.) Fiendish; diabolical.

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