Wordnet 3.0
NOUN (1)
1.
lack of strength or vigor (especially from illness);
The Collaborative International Dictionary of English v.0.48:
adynamia \ad`y*na"mi*a\ ([a^]d`[i^]*n[=a]"m[i^]*[.a]), n. [NL.
adynamia, fr. Gr. 'adynami`a lack of strength; 'a priv +
dy`namis power, strength.] (Med.)
Considerable debility of the vital powers; asthenia.
--Dunglison.
[1913 Webster + AS]
2. Specifically: (Med) Absence of motor power or force.
[AS]
WordNet (r) 3.0 (2006):
adynamia
n 1: lack of strength or vigor (especially from illness)