Here's what rhymes with devilishly.

Consider these alternatives

diabolically / symbolically terrifically / specifically astoundingly / resoundingly clever / ever excruciatingly / unhesitatingly fascinatingly / unhesitatingly hilariously / variously devastatingly / unhesitatingly frustratingly / rustratingly breathtakingly / hreathtakingly extraordinarily / necessarily laborious / glorious improbably / probably