diabolical vs devilish

diabolical and devilish both are adjectives.

Word	Noun	Adjective	Verb	Adverb
diabolical	No	Yes	No	No
devilish	No	Yes	No	Yes

As adjectives, diabolical and devilish are synonyms defined as:

diabolical and devilish: showing the cunning or ingenuity or wickedness typical of a devil

Other synonyms of diabolical include diabolic, mephistophelean, mephistophelian.

diabolical (adjective)	devilish (adjective)
extremely evil or cruel; expressive of cruelty or befitting hell	showing the cunning or ingenuity or wickedness typical of a devil
showing the cunning or ingenuity or wickedness typical of a devil	playful in an appealingly bold way

diabolical (adverb)	devilish (adverb)
	in a playfully devilish manner