WordWeb Online

1. (of a person) possessing physical strength and weight; rugged and powerful
   "a hefty athlete"
   - brawny, muscular, powerful, sinewy, muscly
    
2. Of considerable weight and size
   "a hefty dictionary"
    
3. Large in amount or extent or degree
   "received a hefty bonus"
   - goodly, goodish, healthy, respectable, sizable, sizeable, tidy

Derived forms: heftiest, heftier

See also: considerable, heavy, heft, strong

Encyclopedia: Hefty