What is the Latin word for devilish?

The usual Latin words for “devilish” are diabolicus, nefandus, foedus; also perdō, furiālis. The right choice depends on the sense; see the distinctions below.

English → Latin

“devilish” in Latin

diabolicusdiabolic; relating to the Devil (Satan)nefandusimpious; heinous, execrable, abominable foedustreaty, compact, alliance, truce, league; agreement, bond, contract, compact, pact, pledge, conditions, terms; covenant perdōto destroy, ruin, wreck; to waste, squander; to have no more, to be deprived of furiālisfurious, frenzied; infuriating; avenging

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

devilish

diabolicus (Eccl.): nefandus: foedus. perditus: sceleratissimus, etc. (e.g., nefanda malitia; foeda, perdita, sceleratissima consilia): furialis (mostly poetical, but also Ciceronian, furialis illa vox): diabolicis facibus inflammatus (inspired by the devil).

Quick answer

What is the Latin word for devilish?: The usual Latin words for “devilish” are diabolicus, nefandus, foedus; also perdō, furiālis. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.