Something that's hefty is big and heavy. When you have to lug a hefty suitcase around, it helps if it has wheels.

Hefty objects are large and bulky, and you can describe people as hefty when they're big and brawny and strong. When you buy a hefty bag of dog food for your hefty bull mastiff, you might want to ask a hefty young employee if she'll help you carry it to your car. Hefty comes from heft, which means both "to lift" and "weight or heaviness."

Definitions of hefty
  1. adjective
    of considerable weight and size
    “a hefty dictionary”
    of comparatively great physical weight or density
  2. adjective
    (of a person) possessing physical strength and weight; rugged and powerful
    “a hefty athlete”
    synonyms: brawny, muscular, powerful, sinewy
    having strength or power greater than average or expected
  3. adjective
    large in amount, extent, or degree
    “received a hefty bonus”
    synonyms: goodish, goodly, healthy, respectable, sizable, sizeable, tidy
    large or relatively large in number or amount or extent or degree
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