Devilish

Part of speech: adjective (a.)

1. Resembling, characteristic of, or pertaining to, the devil; diabolical; wicked in the extreme. "Devilish wickedness." Sir P. Sidney. This wisdom descendeth not from above, but is earthly, sensual, devilish. James iii. 15.

2. Extreme; excessive. [Colloq.] Dryden.

Synonyms: Diabolical; infernal; hellish; satanic; wicked; malicious; detestable; destructive. Dev"il*ish*ly, adv. Dev"il*ish*ness, n.