IPA: /ˈfætlɪ/
KK: /ˈfætli/
In a manner that is characterized by being overweight or having a lot of body fat.
He walked fatly down the street, drawing attention from passersby.
Fatly → It is formed from "fat" (from Old English *fǣtt*, meaning having a large amount of body fat) and "-ly" (meaning in a manner of). The word "fatly" means in a manner that is fat or plump.
Think of someone being 'fat' and the '-ly' indicating the manner of being. This helps you remember that 'fatly' describes doing something in a fat or plump way.