IPA: /ˈhaʊlɪŋli/
KK: /haʊlɪŋli/
In a way that produces loud, wailing sounds, often associated with laughter or distress.
The comedian performed howlingly, making the audience burst into laughter.
Howlingly → It is formed from "howl" (of uncertain origin, possibly imitative of the sound made) and "-ingly" (a suffix used to form adverbs indicating manner). The word "howlingly" means in a manner that resembles or is characterized by howling, often used to describe loud, mournful sounds.
Think of the sound of a wolf howling, and remember that 'howlingly' describes doing something in a way that resembles that loud, mournful sound.