Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of considerable weight; heavy.
  • adj. Rugged and powerful. See Synonyms at heavy.
  • adj. Informal Of considerable size or amount: a hefty serving of mashed potatoes; received a hefty bonus.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. heavy
  • adj. strong, bulky
  • adj. possessing physical strength and weight; rugged and powerful; powerfully or heavily built.
  • adj. impressive, mighty

from the GNU version of the Collaborative International Dictionary of English

  • adj. Moderately heavy.
  • adj. Strong; muscular; -- of people.
  • adj. Substantial; large.

from The Century Dictionary and Cyclopedia

  • Having considerable weight; rather heavy; hence, weighty; forcible: as, a hefty tool; a hefty argument.
  • Easy to lift and handle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. of considerable weight and size
  • adj. large in amount or extent or degree
  • adj. (of a person) possessing physical strength and weight; rugged and powerful

Etymologies

heft (“weight”) +‎ -y (Wiktionary)

Examples

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