Adjective headlong has 2 senses
  1. hasty, headlong - excessively quick; "made a hasty exit"; "a headlong rush to sell"
    Antonym: unhurried (indirect, via hurried)
  2. headfirst, headlong - with the head foremost; "a headfirst plunge down the stairs"; "a headlong dive into the pool"
    Antonym: backward (indirect, via forward)
,Adverbial headlong has 3 senses
  1. headlong, headfirst - with the head foremost; "the runner slid headlong into third base"
  2. headlong, precipitately - at breakneck speed; "burst headlong through the gate"
    Derived from adjective headlong1
  3. headlong, rashly - in a hasty and foolhardy manner; "he fell headlong in love with his cousin"
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