devilish

1 going beyond a normal or acceptable limit in degree or amount that's a devilish amount of bad luck for any person to have to endure Synonyms baroque, excessive, exorbitant, extravagant, extreme, fancy, immoderate, inordinate, insane, intolerable, lavish, overdue, overextravagant, overmuch, overweening, plethoric, steep, stiff, towering, unconscionable, undue, unmercifulRelated Words boundless, endless, immeasurable, infinite, limitless; unbearable, unjustifiable, unwarranted; improper, inappropriate, thick, unseemly; unrestrainedNear Antonyms deficient, inadequate, insufficient; minimal, minimumAntonyms middling, moderate, modest, reasonable, temperate

2 of, relating to, or worthy of an evil spirit a devilish plan to sabotage the other party's political convention Synonyms cacodemonic, demoniac (also demoniacal), demonian, demonic (also demonical), fiendish, diabolical (or diabolic), Luciferian, satanicRelated Words hellish, infernal; baleful, evil, sinister; malevolent, malicious, malignant; heinous, monstrous; black, immoral, iniquitous, nefarious, vicious, vile, villainous, wicked; barbarous, cruel, ferocious, inhuman, savageNear Antonyms celestial, heavenly; beneficent, benevolent, benign, benignant; godly, holy, sainted, saintly; ethical, good, moral, righteous, virtuousAntonyms angelic (or angelical)

3 tending to or exhibiting reckless playfulness a devilish grin that told us he was up to something Synonyms arch, mischievous, elvish, espiègle, impish, knavish, leprechaunish, pixie (also pixy), pixieish, prankish, puckish, rascally, roguish, scampish, sly, tricksy, waggish, wickedRelated Words antic, coltish, coy, frisky, frolicsome, kittenish, playful, sportful, sportive; gay, happy, lighthearted, whimsical; energetic, lively, spirited, sprightly; artful, crafty, cunning, trickish, tricky, wily; misbehaving, naughty, troublemaking; pestering, riling, teasingNear Antonyms grave, grim, sedate, sober, solemn, staid, stern