IPA: //ˈfraʊnɪŋli//
KK: /ˈfraʊnɪŋli/
In a way that shows displeasure or disapproval, often by making a facial expression with the eyebrows drawn together and the forehead wrinkled.
She looked at him frowningly when he made the silly joke.
Frowningly → It is formed from "frown" (from Middle English *frounen*, meaning to wrinkle the brow) and "-ly" (meaning in a manner of). The word "frowningly" means in a manner that involves wrinkling the brow, typically indicating displeasure or disapproval.
Think of someone wrinkling their brow to show displeasure — that's what frowningly means, as it describes the manner of frowning.