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Adverb: involuntarily  ,in,vó-lun'te-ru-lee [N. Amer], in'vó-lun-tru-lee [Brit]
  1. Without conscious control or intention
    "he involuntarily flinched at the loud noise"
     
  2. Against one's will; by force or compulsion
    "He was involuntarily committed to the institution";
    - forcibly

Antonym: voluntarily