im·pet·u·os·i·ty

[im-pech-oo-os-i-tee]
noun, plural im·pet·u·os·i·ties for 2.
1.
the quality or condition of being impetuous.
2.
an impetuous action.

Origin:
1575–85; < Late Latin impetuōs(us) impetuous + -ity

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
impetuous (ɪmˈpɛtjʊəs) [Click for IPA pronunciation guide]
 
adj
1.  liable to act without consideration; rash; impulsive
2.  resulting from or characterized by rashness or haste
3.  poetic moving with great force or violence; rushing: the impetuous stream hurtled down the valley
 
[C14: from Late Latin impetuōsus violent; see impetus]
 
im'petuously
 
adv
 
im'petuousness
 
n
 
impetuosity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Impetuosity has a plethora of syllables.
So is cyclotrimethylenetrinitramine. Does it mean:
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Example sentences
They were rushing upon it with tremendous impetuosity.
Under the influence of a suggestion, he will undertake the accomplishment of
  certain acts with irresistible impetuosity.
He wrote and thought with an impetuosity beyond what nature always could endure.
He later accepted he should have stayed away, but this affair exposed more than
  his impetuosity.
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