fiendish vs satanic

fiendish and satanic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fiendish	No	Yes	No	No
satanic	No	Yes	No	No

As adjectives, fiendish and satanic are synonyms defined as:

fiendish and satanic: extremely evil or cruel; expressive of cruelty or befitting hell

Other synonyms of fiendish include demonic, diabolic, diabolical, hellish, infernal, unholy.

fiendish (adjective)	satanic (adjective)
extremely evil or cruel; expressive of cruelty or befitting hell	extremely evil or cruel; expressive of cruelty or befitting hell