'Fiendishly' definitions:
Definition of 'fiendishly'
From: WordNet
adverb
As a devil; in an evil manner; "his writing could be diabolically satiric" [syn: diabolically, devilishly, fiendishly]
Definition of 'Fiendishly'
From: GCIDE
- Fiendish \Fiend"ish\, a. Like a fiend; diabolically wicked or cruel; infernal; malignant; devilish; hellish. -- {Fiend"ish*ly}, adv. -- {Fiend"ish*ness}, n. [1913 Webster]