precipitous

[pri-sip-i-tuhs]
adjective
1.
of the nature of or characterized by precipices: a precipitous wall of rock.
2.
extremely or impassably steep: precipitous mountain trails.

Origin:
1640–50; < obsolete French précipiteux; see precipitate, -ous

precipitously, adverb
precipitousness, noun
unprecipitous, adjective
unprecipitously, adverb
unprecipitousness, noun

precipitate, precipitous.


2. abrupt, sheer, perpendicular.


1, 2. flat, level.
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World English Dictionary
precipitous (prɪˈsɪpɪtəs)
 
adj
1.  resembling a precipice or characterized by precipices
2.  very steep
3.  hasty or precipitate
 
usage  The use of precipitous to mean hasty is thought by some people to be incorrect
 
pre'cipitously
 
adv
 
pre'cipitousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

precipitous
1640s, "rash, headlong," from obs. Fr. precipiteux (16c.), from V.L. *praecipitosus, from praecipitare (see precipitation). Precipitate (adj.) "hasty" is attested from 1650s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
For three long weeks, nearly 200 cyclists barrel through spectacular scenery
  and make lung-bursting ascents of precipitous peaks.
There is only what seems to me a rather low protective barrier given the
  precipitous drop into the deep valleys below.
In reality at the end of every rainbow is a precipitous cliff edge and with
  hordes of lemmings skidding to an abrupt halt.
There is a precipitous drop-off where several terms appear less often with the
  chosen tags.
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