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Adjective: atonic  ey'tó-nik or u'tó-nik
  1. Characterized by a lack of tonus
    "The atonic muscles of the patient indicated a need for physical therapy"
     
  2. (used of syllables) carrying no stress
    "an atonic syllable carries no stress";
    - unaccented

Antonym: accented

Encyclopedia: Atonic