mountainous
adjective
moun·tain·ous
ˈmau̇n-tə-nəs 
ˈmau̇nt-nəs
1
: containing many mountains
mountainous wilderness
2
: resembling a mountain : huge
a stormy ocean with mountainous waves
mountainously
adverb
mountainousness
noun
Synonyms of mountainous
Examples of mountainous in a Sentence
the seemingly mountainous obstacles he had to overcome while growing up
Recent Examples on the Web
The Public Service Commission has approved a flurry of rate hikes in recent years as private utilities grapple with maintaining profits while improving infrastructure in a mountainous, sparsely populated state.
—
ABC News, 9 Apr. 2026
From the mountainous Blue Ridge and Piedmont regions to the Lowcountry, here are 15 of our favorite small towns in South Carolina.
—Tara Massouleh McCay, Southern Living, 9 Apr. 2026
To access a plethora of mountainous backcountry trails, go east.
—Lydia Mansel, Travel + Leisure, 9 Apr. 2026
The region is mountainous with an average elevation of about 3,600 feet (1,100 meters).
—Aman Kumar, Encyclopedia Britannica, 8 Apr. 2026
See All Example Sentences for mountainous
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ABC News, 9 Apr. 2026
From the mountainous Blue Ridge and Piedmont regions to the Lowcountry, here are 15 of our favorite small towns in South Carolina.
—Tara Massouleh McCay, Southern Living, 9 Apr. 2026
To access a plethora of mountainous backcountry trails, go east.
—Lydia Mansel, Travel + Leisure, 9 Apr. 2026
The region is mountainous with an average elevation of about 3,600 feet (1,100 meters).
—Aman Kumar, Encyclopedia Britannica, 8 Apr. 2026
See All Example Sentences for mountainous
Cite this Entry
“Mountainous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mountainous. Accessed 12 Apr. 2026.
Copy CitationKids Definition
mountainous
adjective
moun·tain·ous
ˈmau̇nt-ᵊn-əs
-nəs
1
: having many mountains
2
: resembling a mountain : huge
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