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mountainous

[moun-tn-uh s] /ˈmaʊn tn əs/
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 of mountainous
late Middle English
1400-1450
1400-50; late Middle English mounteynous. See mountain, -ous
Related forms
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. 2015.
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British Dictionary definitions for mountainous

mountainous

/ˈmaʊntɪnəs/
adjective
1.
of or relating to mountains: a mountainous region
2.
like a mountain, esp in size or impressiveness
Derived Forms
mountainously, adverb
mountainousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for mountainous
adj.

late 14c., from Old French montagneux, from Vulgar Latin *montaneosus "mountainous," from *montanea (see mountain).

Online Etymology Dictionary, © 2010 Douglas Harper
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