Headlong describes something done headfirst, rashly, or really quickly. If you’re the star batter on your baseball team, it’s expected that you'll make a headlong dive for the base.

Headlong can refer to hasty actions, but it can also be used more figuratively to describe decisions are reckless or made in hurry. Your sister may tend to weigh all the options, but you make headlong decisions. When you decided headlong to move to Florida for a chance to play professionally, your sister thought you’d gone off your rocker — but the day you sign a major contract, she’ll be singing a different tune.

Definitions of headlong
  1. adverb
    with the head foremost
    “the runner slid headlong into third base”
    synonyms: headfirst
  2. adverb
    in a hasty and foolhardy manner
    “he fell headlong in love with his cousin”
    synonyms: rashly
  3. adverb
    at breakneck speed
    “burst headlong through the gate”
    synonyms: precipitately
  4. adjective
    with the head foremost
    “a headlong dive into the pool”
    synonyms: headfirst
    at or near or directed toward the front
  5. adjective
    excessively quick
    “a headlong rush to sell”
    synonyms: hasty
    moving rapidly or performed quickly or in great haste
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