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
Hailing from mountainous southwestern Virginia, the Stanley Brothers – Ralph and Carter – were a foundational act in bluegrass whose music has influenced generations of artists in a variety of genres.
—
Chris Willman, Variety, 20 Mar. 2026
Soon, there could be military boots on the ground crossing into the Islamic Republic of Iran from this terrain of fertile valleys, deep gorges and ancient Mesopotamian trade routes perched below the mountainous border dividing Iraq and Iran.
—Younes Mohammad, USA Today, 15 Mar. 2026
The island’s interior is mountainous and primitive, covered with mule tracks and drought-resistant vegetation.
—Kristina Kasparian, Travel + Leisure, 15 Mar. 2026
Servicing a mountainous areas like Escondido drives up costs, as an expensive network of pipes and pump stations is needed to move water up and down considerable inclines, said Kyle Morgan, the city’s acting director of utilities and wastewater.
—Lucas Robinson, San Diego Union-Tribune, 15 Mar. 2026
See All Example Sentences for mountainous
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Chris Willman, Variety, 20 Mar. 2026
Soon, there could be military boots on the ground crossing into the Islamic Republic of Iran from this terrain of fertile valleys, deep gorges and ancient Mesopotamian trade routes perched below the mountainous border dividing Iraq and Iran.
—Younes Mohammad, USA Today, 15 Mar. 2026
The island’s interior is mountainous and primitive, covered with mule tracks and drought-resistant vegetation.
—Kristina Kasparian, Travel + Leisure, 15 Mar. 2026
Servicing a mountainous areas like Escondido drives up costs, as an expensive network of pipes and pump stations is needed to move water up and down considerable inclines, said Kyle Morgan, the city’s acting director of utilities and wastewater.
—Lucas Robinson, San Diego Union-Tribune, 15 Mar. 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 27 Mar. 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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