moun·​tain·​ous | \ ˈmau̇n-tə-nəs How to pronounce mountainous (audio) , ˈmau̇nt-nəs\

Definition of mountainous

1 : containing many mountains
2 : resembling a mountain : huge

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Other Words from mountainous

mountainously adverb
mountainousness noun

Examples of mountainous in a Sentence

the seemingly mountainous obstacles he had to overcome while growing up

Recent Examples on the Web

Salvation may come in the next few days as the riders cross the mountainous terrain of the Alps. Erin Davis And Brian Ries, CNN, "Tour de France riders are strapping on ice vests and guzzling water amid a scorching heat wave," 24 July 2019 The town is bookended by mountainous terrain to the east and jewel-blue waters to the west. Brock Keeling, Curbed, "The rise and fall of Laguna Beach, a gay California hotspot," 26 June 2019 The five-ton truck, which was being driven by a soldier trainer, overturned near Camp Natural Bridge, a summer training site of mountainous terrain. Michael Gold, New York Times, "West Point Accident Kills Cadet and Injures 22 Others," 6 June 2019 In all, the project encompasses 5,431 acres of mountainous terrain, including more than 3,600 acres of Forest Service land, nearly 1,200 acres of private land, and other lands owned by the state and federal government. Ian James, azcentral, "Giant Arizona copper mine on hold after judge blocks construction," 28 Apr. 2019 Whether the shorter-than-average landing strips end with an abrupt drop-off or mountainous terrain makes for a twisting flight path, getting to and from these airports takes some serious know-how. Amanda Greene, Woman's Day, "10 Terrifying Airport Runways," 27 Apr. 2011 Flying about 60,000 feet above sparsely populated or mountainous areas, where traditional telecoms don’t bother building networks of cell towers, a single balloon can cover 2,000 square miles with the joy of getting online. Alex Davies, WIRED, "How Loon's Balloons Find Their Way to Deliver the Internet," 23 July 2019 Before 2015, tracking child abuse was left solely to Colorado’s 64 counties, which range from sprawling, urban Denver with more than 600,000 residents to mountainous San Juan County with only about 700. New York Times, "Child Neglect Reports Sat Unread for 4 Years Because of an Email Mix-up," 15 July 2019 Michelle sits facing us, chin resting on one hand, arms bare, rising from a mountainous, floor-length white skirt with geometric patterns in black, red, pink, and yellow. Dodie Kazanjian, Vogue, "Amy Sherald, Michelle Obama’s Portraitist, Readies her New York Debut," 15 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mountainous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of mountainous

14th century, in the meaning defined at sense 1

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Statistics for mountainous

Last Updated

13 Aug 2019

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Time Traveler for mountainous

The first known use of mountainous was in the 14th century

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More Definitions for mountainous



English Language Learners Definition of mountainous

: having many mountains
: extremely large


moun·​tain·​ous | \ ˈmau̇n-tə-nəs How to pronounce mountainous (audio) \

Kids Definition of mountainous

1 : having many mountains mountainous country
2 : like a mountain in size : huge a mountainous pile

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Comments on mountainous

What made you want to look up mountainous? Please tell us where you read or heard it (including the quote, if possible).


to move or obtain by small maneuvers

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