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lassitude

/ˈlæsɪˌtjuːd/ noun

In Latin: lassitūdō Wiktionary

Origin

Borrowed from French lassitude, from Latin lassitūdō (“faintness, weariness”), from lassus (“faint, weary”), perhaps for *ladtus, and thus akin to English late.

From Wiktionary, via Kaikki.org (CC BY-SA)