mountainous

[moun-tn-uhs]
adjective
1.
abounding in mountains: a mountainous wilderness.
2.
of the nature of a mountain.
3.
resembling a mountain or mountains, as being very large and high: mountainous waves.

Origin:
1400–50; late Middle English mounteynous. See mountain, -ous

mountainously, adverb
mountainousness, noun
nonmountainous, adjective
nonmountainously, adverb
semimountainous, adjective
semimountainously, adverb
unmountainous, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mountainous (ˈmaʊntɪnəs)
 
adj
1.  of or relating to mountains: a mountainous region
2.  like a mountain, esp in size or impressiveness
 
'mountainously
 
adv
 
'mountainousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

mountainous
c.1600, from Fr. montagneux, from V.L. *montaniosus, from *montanea (see mountain).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Large swaths of the state are also jagged and mountainous, with mountaintops
  frequently obscured by clouds.
Over one-third of the region's terrain is hilly and mountainous.
Conditions are humid around the coast but become considerably cooler and wetter
  toward the mountainous interior.
The northern side's mountainous terrain is rich in lush vegetation, while the
  southern area is flat and features sandy beaches.
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