adjective
-
of or relating to mountains
a mountainous region
-
like a mountain, esp in size or impressiveness
Other Word Forms
Derived Forms
Etymology
Origin of mountainous
First recorded in 1400–50, mountainous is from the late Middle English word mounteynous. See mountain, -ous
Vocabulary lists containing mountainous
South America - Middle School
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
Eastern Europe - Introductory
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
East Asia - Middle School
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Bundibugyo is one of four species or strains of Ebola known to infect humans, named after a mountainous district in Uganda where the first outbreak took place in 2007.
From The Wall Street Journal • May 22, 2026
A meticulously detailed log with windows, for instance, or a car that seems to balance natural, mountainous wonders on its back.
From Los Angeles Times • May 20, 2026
After a couple of months, they went to a mountainous village south of Valencia called Villalonga to live with a woman called Trixie.
From BBC • May 13, 2026
After Tony Dunn lost his home in a California wildfire, he moved to mountainous North Carolina to avoid more climate disasters.
From Barron's • May 11, 2026
He had walked into a poor, mountainous, and sparsely populated part of China’s Jilin Province.
From "Escape from Camp 14: One Man's Remarkable Odyssey from North Korea to Freedom in the West" by Blaine Harden
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
