ASTHENIA Meaning of ASTHENIA in English [ əs'θi:nɪə ]■ noun Medicine abnormal physical weakness or lack of energy.Derivativesasthenic adjective OriginC18: mod. L., from Gk astheneia , from asthenēs 'weak'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004