• synonyms


[moun-tn-uh s]
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  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.
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Origin of mountainous

First recorded in 1400–50, mountainous is from the late Middle English word mounteynous. See mountain, -ous
Related formsmoun·tain·ous·ly, adverbmoun·tain·ous·ness, nounnon·moun·tain·ous, adjectivenon·moun·tain·ous·ly, adverbsem·i·moun·tain·ous, adjectivesem·i·moun·tain·ous·ly, adverbun·moun·tain·ous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for mountainous


  1. of or relating to mountainsa mountainous region
  2. like a mountain, esp in size or impressiveness
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Derived Formsmountainously, adverbmountainousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mountainous


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

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Online Etymology Dictionary, © 2010 Douglas Harper