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
There’s the Basque population in Boise, Idaho, whose ancestors traded a mountainous region between France and Spain for the American West in the hopes of finding gold but later turned to sheep herding.
—
Albert Sun,
New York Times,
2 July 2026
Northern Spain’s mountainous scenery surrounds Oviedo and boasts lower levels of light pollution than other metropolitan centers.
—
Kaitlyn McInnis,
Forbes.com,
30 June 2026
Because the island is so steep and mountainous, even shorter routes can involve serious climbs and uneven terrain.
—
Chadner Navarro,
Travel + Leisure,
30 June 2026
Vineyards in Amarone della Valpolicella DOCG are situated north of Verona in a 20-mile-wide mountainous band at the foot of the Dolomites at altitudes ranging from 500 to 1,640 feet above sea level, with heights above 1,100 feet really making the difference.
—
Mike Desimone,
Robb Report,
28 June 2026
See All Example Sentences for mountainous
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Albert Sun,
New York Times,
2 July 2026
Northern Spain’s mountainous scenery surrounds Oviedo and boasts lower levels of light pollution than other metropolitan centers.
—
Kaitlyn McInnis,
Forbes.com,
30 June 2026
Because the island is so steep and mountainous, even shorter routes can involve serious climbs and uneven terrain.
—
Chadner Navarro,
Travel + Leisure,
30 June 2026
Vineyards in Amarone della Valpolicella DOCG are situated north of Verona in a 20-mile-wide mountainous band at the foot of the Dolomites at altitudes ranging from 500 to 1,640 feet above sea level, with heights above 1,100 feet really making the difference.
—
Mike Desimone,
Robb Report,
28 June 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 5 Jul. 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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