adj. 25B6; adjective
a hefty young man : BURLY, heavy, sturdy, strapping, bulky, brawny, husky, strong, muscular, large, big, solid, well built; portly, stout; informal hulking, hunky, beefy.
a hefty kick : POWERFUL, violent, hard, forceful, heavy, mighty.
hefty loads of timber : HEAVY, weighty, bulky, big, large, substantial, massive, ponderous; unwieldy, cumbersome, burdensome; informal hulking.
a hefty fine : SUBSTANTIAL, sizeable, considerable, stiff, extortionate, large, excessive; informal steep, astronomical, whopping.
slight, feeble, light, small.