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The animal felt lassitude, or a lack of energy.
Noun.
A state of physical or mental weariness; lack of energy.
When my doctor asks me to describe my symptoms, my main complaint is lassitude since I have very little energy.
The Declaration • May 8, 2019 • https://thedeclarationatcoloniahigh.com/40128/wordoftheday/lassitude/
Lassitude