1.Definition: (of a person) possessing physical strength and weight; rugged and powerful

"A hefty athlete"

Related Adjective(s):brawny, muscular, powerful, sinewy

2.Definition: large in amount or extent or degree

"Received a hefty bonus"

Related Adjective(s):goodish, goodly, healthy, respectable, sizable, sizeable, tidy

3.Definition: of considerable weight and size

"A hefty dictionary"