
English word hefty comes from English -y, English heft
-y (English)
Forming abstract nouns denoting a state, condition, or quality.. Used in the name of some locations which end in -ia in Latin. Forming diminutive nouns. Also used for familiar and pet names as a term of endearment. Added to nouns and adjectives to form adjectives meaning “having the quality of”.. Added to verbs to form adjectives meaning "inclined to".
heft (English)
(Northern England) A piece of mountain pasture to which a farm animal has become hefted (accustomed).. (US, dated, colloquial) The greater part or bulk of anything.. (West of Ireland) Poor condition in sheep caused by mineral deficiency.. (uncountable) Weight.. An animal that has become hefted thus.. Heaviness, the feel of weight.. The act or effort of heaving; violent strain or exertion. [...]
hefty (English)
(of a person) Possessing physical strength and weight; rugged and powerful; powerfully or heavily built.. Heavy.. Impressive, mighty.. Strong, bulky.