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
Prior to word of the rescue, social media footage showed American drones, aircraft and helicopters flying over the mountainous region where a TV channel affiliated with Iranian state television said earlier that at least one pilot bailed out of the fighter jet.
—
Sam Mednick, Fortune, 3 Apr. 2026
The disappearance of Christina Marie Plante from Star Valley, a small community in a mountainous area northeast of Phoenix, in 1994 sparked an extensive search that included volunteers, the sheriff’s office said.
—Phil Helsel, NBC news, 2 Apr. 2026
Offshore winds are expected to begin ramping up on Friday, ranging from 25 to 45 mph in Los Angeles County with gusts up to 60 mph in some of the mountainous and less populated areas of Ventura County, according to the National Weather Service.
—Los Angeles Times, 2 Apr. 2026
The Strait is a narrow passage of deep, dark-blue water that tracks along Iran’s arid, mountainous southern coastline and transports round a fifth of world’s oil and gas.
—Laura Paddison, CNN Money, 2 Apr. 2026
See All Example Sentences for mountainous
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Sam Mednick, Fortune, 3 Apr. 2026
The disappearance of Christina Marie Plante from Star Valley, a small community in a mountainous area northeast of Phoenix, in 1994 sparked an extensive search that included volunteers, the sheriff’s office said.
—Phil Helsel, NBC news, 2 Apr. 2026
Offshore winds are expected to begin ramping up on Friday, ranging from 25 to 45 mph in Los Angeles County with gusts up to 60 mph in some of the mountainous and less populated areas of Ventura County, according to the National Weather Service.
—Los Angeles Times, 2 Apr. 2026
The Strait is a narrow passage of deep, dark-blue water that tracks along Iran’s arid, mountainous southern coastline and transports round a fifth of world’s oil and gas.
—Laura Paddison, CNN Money, 2 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 5 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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