lassitude
1 antonym for lassitude — opposites grouped by meaning.
Noun — A feeling of tiredness and lack of energy.
Antonyms
Etymology
Borrowed from French lassitude, which came from Latin lassitūdō (“faintness, weariness”), from lassus (“faint, weary”), perhaps for *ladtus, and so related to English late.
Full origin of lassitude →