asthenia (n.) Look up asthenia at Dictionary.com
"weakness," 1802, Modern Latin, from Greek asthenia "want of strength, weakness, feebleness, sickness; a sickness, a disease," from asthenes "weak, without strength, feeble," from a- "not, without" (see a- (3)) + sthenos "strength," which is probably from PIE *segh- "to hold" (see scheme (n.)).