This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Loss or lack of bodily strength; weakness; debility.

n. weakness; loss of strength

n. Want or loss of strength; debility; diminution of the vital forces.

n. In pathology, debility; want of strength. Also astheny.

n. [capitalized] In zoology, a genus of insects.

n. an abnormal loss of strength

"He died at the age of thirty-two from “asthenia from pneumonia,” probably as a secondary result of sickle cell disease."

astheny   

feebleness    infirmity    frailty    frailness    debility    valetudinarianism   

debility   

abusiveness    xerostomia    slater    headedness    lightheadedness    aukwardness    bowwow    senselessness    myalgia    retrogradation