IPA: /ˈdɛv.ɪ.lɪʃ.li/
KK: /ˈdɛvəlɪʃli/
In a way that is mischievous or wicked, often with a sense of enjoyment or cleverness.
He smiled devilishly as he revealed his clever plan.
Devilishly → It is formed from "devil" (from Old English "deofol", meaning a malevolent spirit or adversary) and the suffix "-ishly" (meaning in a manner of). The word "devilishly" means in a manner characteristic of a devil, often implying mischievousness or wickedness.
Think of the word 'devil' as representing a mischievous spirit, and remember that 'devilishly' describes actions done in a wicked or playful manner, like a devil would.
No commonly confused words.