headlong

[hed-lawng, -long]
adverb
1.
with the head foremost; headfirst: to plunge headlong into the water.
2.
without delay; hastily: to plunge headlong into work.
3.
without deliberation; rashly: to rush headlong into battle.
adjective
4.
undertaken quickly and suddenly; made precipitately; hasty: a headlong flight.
5.
rash; impetuous: a headlong denunciation.
6.
done or going with the head foremost: a headlong dive into the pool.

Origin:
1350–1400; Middle English hedlong, earlier hedling. See head, -ling2

headlongness, noun

headlong, headstrong.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
headlong (ˈhɛdˌlɒŋ)
 
adv, —adj
1.  with the head foremost; headfirst
2.  with great haste
 
adj
3.  archaic (of slopes, etc) very steep; precipitous

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

headlong
1482, from hed "head" + suffix -ling (see grovel). Altered by folk etymology on pattern of sidelong, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The last thing you want to do is plunge headlong into a story that does not
  give him the information he is seeking.
They are a franchise that spent lavishly in a headlong quest to get what it
  wanted.
So they rushed headlong into new trouble by attacking the foreigners and their
  legations.
With staunch academic discipline they've plunged headlong into the fundamental
  physics of ram acceleration.
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