Hefty

wiktionary

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19th 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.

etymonline

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hefty (adj.)

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