a state of comatose torpor (as found in sleeping sickness)
<noun.state>
a feeling of lack of interest or energy
<noun.feeling>
weakness characterized by a lack of vitality or energy
<noun.attribute>
Lassitude \Las"si*tude\ (l[a^]s"s[i^]*t[=u]d), n. [L. lassitudo, fr. lassus faint, weary; akin to E. late: cf. F. lassitude. See {Late}.] 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.
The corporeal instruments of action being strained to a high pitch . . . will soon feel a lassitude. --Barrow.
Standard & Poor's 500-stock index showed similar lassitude, rising only about 4% after a first-quarter jump of more than 20%.