Why is it die Ehrlichkeit?

Ehrlichkeit ends in -keit, and nouns ending in -keit are feminine: in a German dictionary, 100% of them take die.

All nouns ending in -keit
Sense 1
die

Meaning

[1] The property of being sincere and honest

[1] die Eigenschaft aufrichtig und ehrlich zu sein

Examples

[1] "Among his contemporaries, he was known for his eloquence, his blunt honesty towards his monarch and his poetry"

[1] „Unter seinen Zeitgenossen war er bekannt für seine Redegewandtheit, seine unverblümte Ehrlichkeit gegenüber seinem Monarchen und seine Poesie.“

[1] "His honesty and his care for the prisoners were exemplary liability"

[1] „Seine Ehrlichkeit und seine Fürsorge für die Gefangenen waren beispielhaft.“
More source examples (1)

These dictionary examples can include historical and less common uses.

[1] "The pirate was affected for a while, as it seemed, about the rigid honesty of the old man's man"

[1] „Der Seeräuber stand eine Weile betroffen, wie es schien, über die starre Ehrlichkeit des alten Mannes.“

Declension

1 Singular Plural
Nominativ die Ehrlichkeit —
Genitiv der Ehrlichkeit —
Dativ der Ehrlichkeit —
Akkusativ die Ehrlichkeit —

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary