adjective, heft·i·er, heft·i·est.

  1. heavy; weighty: a hefty book.
  2. big and strong; powerful; muscular: a hefty athlete.
  3. impressively large or substantial: a hefty increase in salary.

adjective heftier or heftiest informal

  1. big and strong
  2. characterized by vigour or forcea hefty blow
  3. large, bulky, or heavy
  4. sizable; involving a large amount of moneya hefty bill; a hefty wage

1867, from heft + -y (2). Related: Heftiness.

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