Heavy-set describes a person with a solid, stocky build—broad and thick rather than tall or lean.
The term is often used as a polite or neutral way to describe someone who carries extra weight: a heavy-set man in his fifties, She was short and heavy-set.
It emphasizes sturdiness more than fatness.
1. physique — stocky, Short and solidly built; thickset (Heavily and solidly built); burly (Heavily muscled and broad); stout (Heavy, dark brewed beverage); portly · corpulent · rotund · plump · chubby · husky · beefy · chunky · pudgy · paunchy
2. build — muscular, Having well-developed sinews; powerful (Having great strength); brawny (Physically powerful, well-muscled); strapping (Muscular and hale); solid · sturdy · rugged · well-built · athletic · strong · robust · tough · broad-shouldered · compact