Why is it die Unmenge?

Unmenge ends in -e, and most nouns ending in -e are feminine: in a German dictionary, 79% of them take die.

All nouns ending in -e
Sense 1
die

Meaning

[1] Very large, oversized amount

[1] sehr große, übergroße Menge

Examples

[1] "This huge amount of volunteers who are all over the country" everywhere "

[1] „Diese Unmenge von freiwilligen Helfern, die überall im ganzen Land sind.“

[1] "In addition to potash, they also used tons of wood and water"

[1] „Neben Pottasche verbrauchten sie noch Unmengen von Holz und Wasser.“
More source examples (2)

These dictionary examples can include historical and less common uses.

[1] "He needed tons of firewood and the rest of the day, Brian commuted back and forth between the storage area and the forest to take enough branches" "

[1] „Er brauchte Unmengen Feuerholz und den Rest des Tages pendelte Brian zwischen dem Lagerplatz und dem Wald hin und her, um genug Äste heranzuschleppen.“

[1] "The tea was very bitter, but was granted by the huge sugar"

[1] „Der Tee war sehr bitter, wurde aber durch die Unmenge Zucker genießbar.“

Declension

1 Singular Plural
Nominativ die Unmenge die Unmengen
Genitiv der Unmenge der Unmengen
Dativ der Unmenge den Unmengen
Akkusativ die Unmenge die Unmengen

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary