Meaning

adjective (of a person) possessing physical strength and weight; rugged and powerful

adjective of considerable weight and size

adjective large in amount or extent or degree

origin19th century. From heft (“weight”) + -y. The similarity with German heftig (“vigorous, violent, intense”) is apparently coincidental. From the German are Dutch, Danish, Norwegian heftig, Swedish häftig.

Etymology from Wiktionary, CC BY-SA 3.0