köken: From Middle High German heftec, from Old High German heiftig, probably from or related to Proto-West Germanic *haifsti (“struggle, conflict”). Compare Yiddish העפֿטיק (heftik). Probably influenced by Middle High German heifte (“impetuous”).
aile: Heftigkeit
Heftige Gewitter haben am Wochenende in Teilen Deutschlands erhebliche Schäden angerichtet.