Icelandic

Noun

fimbulvetur m ‎(genitive singular fimbulvetrar, nominative plural fimbulvetur)

1. A harsh winter, the great and awful darkness preceding the end of the world as written in the Prose Edda ‎(“Younger Edda”). It says three successive winters will come where snow and wind comes from all directions, without any intervening summer; during this time, there will be innumerable wars and ties of blood will no longer be respected: the next-of-kin will lay together and brothers will kill brothers.^[1] See Fimbulwinter on Wikipedia.

Declension

References

1. ↑ Fimbulvinter (Store norske leksikon)