Noun
A condition of the body, or mind, when its voluntary functions are performed with difficulty, and only by a strong exertion of the will; languor; debility; weariness.
Source: Webster's dictionaryThis reason for this lassitude is unknown but can be attributed to lack of interest, a failure to appreciate the size of the potential market, and a lack of desire to be involved in smaller, less prestigious projects. Source: Internet
Whereas all the rest of his writing was designed to get the readers out of their lassitude and mistaken conceptions, the discourses, early and late, were the goal of the literature. Source: Internet