1. With the head foremost
   "the runner slid headlong into third base"
   - headfirst 
2. At breakneck speed
   "burst headlong through the gate"
   - precipitately 
3. In a hasty and foolhardy manner
   "he fell headlong in love with his cousin"
   - rashly

1. Excessively quick
   "a headlong rush to sell"
   - hasty, gadarene, Gadarene 
2. With the head foremost
   "a headlong dive into the pool"
   - headfirst

See also: forward, hurried

Encyclopedia: Headlong

• labetalol
• labetalol hydrochloride
• labia majora
• labia minora
• labial
• labial artery
• labial consonant
• labial pipe
• labial stop
• labial vein
• labialise
• labialize
• Labiatae
• labiate
• labile
• lability
• labiodental
• labiodental consonant
• labium
• Lablab
• Lablab purpureus
• LABLINK
• labor
• labor agreement
• labor camp