IPA: /ˈfæt.nəs/
KK: /ˈfæt.nəs/
The condition of having a lot of body fat or being overweight.
The doctor advised her to maintain a healthy weight to avoid the risks associated with fatness.
Fatness → It is formed from "fat" (from Old English *fǣtt*, meaning having a large amount of body fat) and "-ness" (meaning the state or quality of). The word "fatness" refers to the state of being fat or having excess body fat.
Think of the word 'fat' which describes having a lot of body fat, and '-ness' indicates a state or quality. So, fatness is the state of being fat.