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Adjective: headfirst  'hed'furst
  1. With the head foremost
    "a headfirst plunge down the stairs";
    - headlong
Adverb: headfirst  'hed'furst
  1. With the head before the body
    "the runner slid headfirst into third base";
    - headlong

See also: forward

Encyclopedia: Headfirst