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

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 Thunderstorms and the risk of flooding persisted in mountainous areas of greater Los Angeles on Sunday. CBS News, 12 Sep. 2022 The Los Angeles basin could be drenched with an inch or more of rainfall, Reppert said, adding that San Diego and nearby mountainous areas could see more than 10 inches of rain. Ashley R. Williams, USA TODAY, 10 Sep. 2022 Thunderstorms were forecast for the Los Angeles region Saturday that could linger in mountainous areas on Sunday. Amy Taxin, ajc, 10 Sep. 2022 The country’s weather agency had warned it would be hit by unusually strong and destructive rains in the August-December season and advised people living in mountainous areas to be vigilant or evacuate to safer areas. Bethlehem Feleke, CNN, 8 Sep. 2022 Hundreds of people living in mountainous areas in Seoul were evacuated to prevent damage from landslides Monday night. Hakyung Kate Lee, ABC News, 9 Aug. 2022 These incidents all point to the possibility that a new pathogen could be spreading unchecked across Nepal’s mountainous areas. Ben Ayers, Outside Online, 27 July 2022 Casitas is a long-term photography project that documents Puerto Ricans who live in wooden homes in the mountainous areas of the island. Vogue, 20 July 2022 Rising global temperatures are slowly weakening glacier systems in mountainous areas, where millions of people rely on these reservoirs as a source of freshwater. Kasha Patel, Anchorage Daily News, 13 July 2022 See More

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.

First Known Use of mountainous

14th century, in the meaning defined at sense 1

History and Etymology for mountainous

Middle English mounteynous, borrowed from Anglo-French muntaignus, from muntaigne, mountaigne mountain + -us -ous

Learn More About mountainous

Time Traveler for mountainous

Time Traveler

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

See more words from the same century

Dictionary Entries Near mountainous

mountain of Venus


mountain oyster

See More Nearby Entries 

Statistics for mountainous

Last Updated

4 Oct 2022

Cite this Entry

“Mountainous.” Dictionary, Merriam-Webster, Accessed 5 Oct. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for mountainous


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

More from Merriam-Webster on mountainous

Nglish: Translation of mountainous for Spanish Speakers

Britannica English: Translation of mountainous for Arabic Speakers


Test Your Vocabulary

Challenging Words You Should Know

  • hedgehog reading a book
  • Often used to describe “the march of time,” what does inexorable mean?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!