Etymology
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hefty (adj.)

"having considerable weight," 1866, from heft (n.) + -y (2). Related: Heftiness.

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Definitions of hefty

hefty (adj.)
(of a person) possessing physical strength and weight; rugged and powerful;
a hefty athlete
Synonyms: brawny / muscular / powerful / sinewy
hefty (adj.)
of considerable weight and size;
a hefty dictionary
hefty (adj.)
large in amount or extent or degree;
received a hefty bonus
Synonyms: goodly / goodish / healthy / respectable / sizable / sizeable / tidy
From wordnet.princeton.edu