head·long

[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.
00:10
Headlong is a GRE word you need to know.
So is opaque. Does it mean:
not transparent or translucent; impenetrable to light; not allowing light to pass through.
tending or threatening to break out into open violence; explosive:

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

head·long·ness, noun

headlong, headstrong.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
headlong (ˈhɛdˌlɒŋ) [Click for IPA pronunciation guide]
 
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
There goes a horse into a deep hole and his rider falls headlong out of the
  saddle.
They are a franchise that spent lavishly in a headlong quest to get what it
  wanted.
The three moose, bleating at the sight of breakfast, rushed headlong for the
  scientists.
Yet the headlong expansion continues, either through the opening of yet more
  new stores or through a rash of takeovers.
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