Lassitude, lethargy and languor

Lassitude, lethargy and languor have similar meanings, but one of these words has a slightly different definition from the others. We will examine the meanings of lassitude, lethargy and languor, where these words come from and some examples of their use in sentences.Lassitude denotes a state of tiredness or laziness, a lack of energy, weariness […]
from Grammarist
http://grammarist.com/usage/lassitude-lethargy-and-languor/