Hundseofontigseofon-feald

According to the Old English Dictionary:

hundseofontigseofon-feald

adj. Seventy-and-sevenfold :-- Seofon-feald wracu bið gesealde for Cain and hundseofontigseofonfeald (septuagies septies) for Lamech, Gen. 4, 24. hundseofontigseofon-feald