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lack or loss of strength; weakness.
Historical Examples

In that disease the vast majority of cases die by asthenia, or else by sudden failure of the heart.
Alcohol: A Dangerous and Unnecessary Medicine, How and Why Martha M. Allen

Attacks of syncope appear, and in fatal cases—which are not common—death results from asthenia.
A System of Practical Medicine By American Authors, Vol. II Various

Toward the end of October, his asthenia had diminished enough to allow him to play the piano weakly in three octaves.
Sacrifice Stephen French Whitman

Death takes place by asthenia in from six weeks to six months; occasionally within a fortnight from the apparent onset.
A System of Practical Medicine By American Authors, Vol. II Various

Paresis or asthenia may be found in the trunk muscles, or evidenced by weakness of the grip, or drooping of the head to one side.
Manual of Surgery Volume Second: Extremities–Head–Neck. Sixth Edition. Alexander Miles

The disease runs a chronic course, and usually terminates in death by asthenia.
A System of Practical Medicine By American Authors, Vol. II Various

When the eschars have become detached, suppuration exhausts the forces of the patient, and death takes place by asthenia.
A System of Practical Medicine By American Authors, Vol. II Various

Unless the stricture is relieved the patient gradually dies from asthenia.
A System of Practical Medicine By American Authors, Vol. II Various

noun
(pathol) an abnormal loss of strength; debility
n.

“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-, privative prefix (see a- (3)), + sthenos “strength,” of uncertain origin.

asthenia as·the·ni·a (ās-thē’nē-ə)
n.
Loss or lack of bodily strength; weakness; debility.
as·then’ic (-thěn’ĭk) adj.