[ moun-tn-uh s ]
/ ˈmaʊn tn əs /


abounding in mountains: a mountainous wilderness.
of the nature of a mountain.
resembling a mountain or mountains, as being very large and high: mountainous waves.

Nearby words

  1. mountain whitefish,
  2. mountain wind,
  3. mountainboard,
  4. mountaineer,
  5. mountaineering,
  6. mountainside,
  7. mountaintop,
  8. mountainy,
  9. mountbatten,
  10. mountebank

Origin of mountainous

First recorded in 1400–50, mountainous is from the late Middle English word mounteynous. See mountain, -ous

Related forms Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mountainous

British Dictionary definitions for mountainous


/ (ˈmaʊntɪnəs) /


of or relating to mountainsa mountainous region
like a mountain, esp in size or impressiveness
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).

Online Etymology Dictionary, © 2010 Douglas Harper