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
Rescuers at the scene have detailed on social media the challenging mountainous terrain and heavy rain that has hampered their work.
—
Matt Gutman, CBS News, 27 May 2026
Rescuers at the scene have detailed on social media the challenging mountainous terrain and heavy rain that is hampering the operation.
—ABC News, 26 May 2026
The 26-mile (42-kilometer) route takes hikers through steep, mountainous terrain, reaching altitudes of 4,200 meters (around 13,800 feet).
—Sam Peters, CNN Money, 22 May 2026
Most of the mountainous regions in Colorado are our ancestral homelands.
—Shaun Chapoose, Denver Post, 20 May 2026
See All Example Sentences for mountainous
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Matt Gutman, CBS News, 27 May 2026
Rescuers at the scene have detailed on social media the challenging mountainous terrain and heavy rain that is hampering the operation.
—ABC News, 26 May 2026
The 26-mile (42-kilometer) route takes hikers through steep, mountainous terrain, reaching altitudes of 4,200 meters (around 13,800 feet).
—Sam Peters, CNN Money, 22 May 2026
Most of the mountainous regions in Colorado are our ancestral homelands.
—Shaun Chapoose, Denver Post, 20 May 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 31 May. 2026.
Copy CitationKids Definition
mountainous
adjective
moun·tain·ous
ˈmau̇nt-ᵊn-əs
-nəs
1
: having many mountains
2
: resembling a mountain : huge
Love words? Need even more definitions?
Merriam-Webster unabridged
