As an adjective fiendish is
sinister; evil; conniving; in the manner of a fiend.
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Not English
Wikidiffcom has no English definition. It may be misspelled. fiendish
English
Adjective
(
en adjective)
Sinister; evil; conniving; in the manner of a fiend.
Derived terms
* fiendishly
* fiendishness
Anagrams
* finished