As an adjective fiendish
is sinister; evil; conniving; in the manner of a fiend.
As an adverb devilishly is
in a devilish manner.
fiendish
English
Adjective
(
en adjective)
Sinister; evil; conniving; in the manner of a fiend.
Derived terms
* fiendishly
* fiendishness
Anagrams
* finished