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Adjective: adynamic  ,ey,dI'na-mik or ,a-du'na-mik
Usage: archaic
  1. Characterized by an absence of force or forcefulness
    "The adynamic presentation failed to engage the audience";
    - undynamic
     
  2. Lacking energy or vitality
    "After his illness, he felt adynamic for weeks";
    - asthenic, debilitated, enervated

See also: backward, moribund, stagnant, weak

Antonym: dynamic