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 plane crashed into mountainous terrain in unknown circumstances, according to preliminary information, the National Transportation Safety Board said.
—
Arkansas Online, 14 Feb. 2026
Rescuers in Italy reported Monday that at least a dozen skiers, climbers and hikers died over the past week in a record-setting tragedy in the country’s mountainous terrain.
—Bonny Chu, FOXNews.com, 11 Feb. 2026
The Sierra Nevada red fox is a distinct lineage from the common red fox known for residing in high-elevation, remote mountainous regions.
—Clara Harter, Los Angeles Times, 11 Feb. 2026
In one photo, Perry and the former Canadian Prime Minister have ski gear on, with a mountainous landscape behind them.
—Rachel Burchfield, InStyle, 11 Feb. 2026
See All Example Sentences for mountainous
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Arkansas Online, 14 Feb. 2026
Rescuers in Italy reported Monday that at least a dozen skiers, climbers and hikers died over the past week in a record-setting tragedy in the country’s mountainous terrain.
—Bonny Chu, FOXNews.com, 11 Feb. 2026
The Sierra Nevada red fox is a distinct lineage from the common red fox known for residing in high-elevation, remote mountainous regions.
—Clara Harter, Los Angeles Times, 11 Feb. 2026
In one photo, Perry and the former Canadian Prime Minister have ski gear on, with a mountainous landscape behind them.
—Rachel Burchfield, InStyle, 11 Feb. 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 15 Feb. 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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