say it: DEV-lish
devilish is an adjective and adverb meaning "showing the cunning or ingenuity or wickedness typical of a devil". It carries 3 recorded senses.
showing the cunning or ingenuity or wickedness typical of a devil
“devilish schemes”
“the cold calculation and diabolic art of some statesmen”
“the diabolical expression on his face”
“a mephistophelian glint in his eye”
in a playfully devilish manner
“the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for devilish come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.