lack or loss of strength; weakness.

1795–1805; < Neo-Latin < Greek asthéneia weakness, equivalent to asthene-, stem of asthenḗs (a- a-6 + sthene-, variant stem of sthénos strength) + -ia -ia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
asthenia or astheny (æsˈθiːnɪə, ˈæsθənɪ)
pathol an abnormal loss of strength; debility
[C19: via New Latin from Greek astheneia weakness, from a-1 + sthenos strength]
astheny or astheny
[C19: via New Latin from Greek astheneia weakness, from a-1 + sthenos strength]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"weakness," 1789 (in asthenic), Mod.L., from Gk. asthenia, from asthenes "weak," from a-, privative prefix, + sthenos "strength," of uncertain origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

asthenia as·the·ni·a (ās-thē'nē-ə)
Loss or lack of bodily strength; weakness; debility.

as·then'ic (-thěn'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


a condition in which the body lacks or has lost strength either as a whole or in any of its parts. General asthenia occurs in many chronic wasting diseases, such as anemia and cancer, and is probably most marked in diseases of the adrenal gland. Asthenia may be limited to certain organs or systems of organs, as in asthenopia, characterized by ready fatigability of vision, or in myasthenia gravis, in which there is progressive increase in the fatigability of the muscular system. Neurocirculatory asthenia is a clinical syndrome characterized by breathing difficulties, heart palpitations, a shortness of breath or dizziness, and insomnia. The term neurasthenia was formerly used to describe a mental disorder with such symptoms as easy fatigability, lack of motivation, and feelings of inadequacy.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
In some patients, this asthenia is characterized by drowsiness or apathy.
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