Entry 2 senses Webster, 1913 adynamia /(ăd`ĭ*nā"mĭ*ȧ)/ · ad·y·na·mi·a · IPA 01 n. Considerable debility of the vital powers; asthenia. 1. Considerable debility of the vital powers; asthenia.(Med.) 2. Absence of motor power or force.(Med)