Etymology
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headlong (adv.)

late 14c., headling, also headlings, "headfirst (downward); headlong (forward); without thinking, hastily," from hed "head" (see head (n.)) + adverbial suffix -ling. Altered by c. 1400 to conform with sidelong, etc. Its true companions are now mostly obsolete: darkling, backling, flatling, etc.

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Definitions of headlong
1
headlong (adv.)
with the head foremost;
the runner slid headlong into third base
Synonyms: headfirst
headlong (adv.)
at breakneck speed;
burst headlong through the gate
Synonyms: precipitately
headlong (adv.)
in a hasty and foolhardy manner;
he fell headlong in love with his cousin
Synonyms: rashly
2
headlong (adj.)
excessively quick;
a headlong rush to sell
Synonyms: hasty
headlong (adj.)
with the head foremost;
a headlong dive into the pool
Synonyms: headfirst
From wordnet.princeton.edu