Lassitude n. : 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.

Example:
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Taxonomy
lassitude, weariness, Dictionary, tude, Synonyms, Houghton Mifflin Company, listlessness, word origin, lassus, Pronunciation, lass, Medical Dictionary, lack of energy, The American, American Heritage, free online English dictionary, dictionary results, free online dictionary.

Defination from the web:
Lassitude - Definition of Lassitude at Dictionary.com a free online dictionary with pronunciation, synonyms, and translation of Lassitude. ... lassitude las·si·tude (lās'ĭ-t&oomacr;d', -ty&oomacr;d') n. A state or feeling of weariness, diminished energy, or listlessness. ...