Webster's Revised Unabridged Dictionary · 1913

adynamia

adynamia (ad`i*nā"mi*ȧ) , noun

[New Latin adynamia, from Greek 'adynami`a lack of strength; 'a priv + dy`namis power, strength.]

(Medicine) Considerable debility of the vital powers; asthenia. — Dunglison
2.
(Med) Absence of motor power or force.