mountainous
adjective
moun·tain·ous
ˈmau̇n-tə-nəs 
ˈmau̇nt-nəs
mountainously
adverb
mountainousness
noun
Synonyms
- astronomical
- astronomic
- Brobdingnagian
- bumper
- colossal
- cosmic
- cosmical
- cyclopean
- elephantine
- enormous
- galactic
- gargantuan
- giant
- gigantesque
- gigantic
- grand
- herculean
- heroic
- heroical
- Himalayan
- huge
- humongous
- humungous
- immense
- jumbo
- king-size
- king-sized
- leviathan
- mammoth
- massive
- mega
- mighty
- monster
- monstrous
- monumental
- oceanic
- pharaonic
- planetary
- prodigious
- super
- super-duper
- supersize
- supersized
- titanic
- tremendous
- vast
- vasty
- walloping
- whacking
- whopping
Examples of mountainous in a Sentence
the seemingly mountainous obstacles he had to overcome while growing up
Recent Examples on the Web
Climate & Environment Amid extreme heat, California adopts long-term water-saving targets for cities
July 9, 2024
Those long treks for crews through mountainous and remote regions to battle fires is made even more dangerous by the unprecedented levels of extreme heat.
—
Jireh Deng, Los Angeles Times, 16 July 2024
The treacherous 66-mile hike through a mountainous rainforest region connecting South and Central America has seen an increase in the number of migrants willing to risk their lives and safety to cross it.
—Alexandra Banner, CNN, 12 July 2024
All of the 2024 World’s Best Awards winners are located in the mountainous southwest corner of Montana and almost all are on ranches with open space and herds of horses.
—Evie Carrick, Travel + Leisure, 9 July 2024
The mountainous country, formerly part of the Soviet Union, borders China on the east and south.
—Mathew Miranda, Sacramento Bee, 9 July 2024
See all Example Sentences for mountainous 
Jireh Deng, Los Angeles Times, 16 July 2024
The treacherous 66-mile hike through a mountainous rainforest region connecting South and Central America has seen an increase in the number of migrants willing to risk their lives and safety to cross it.
—Alexandra Banner, CNN, 12 July 2024
All of the 2024 World’s Best Awards winners are located in the mountainous southwest corner of Montana and almost all are on ranches with open space and herds of horses.
—Evie Carrick, Travel + Leisure, 9 July 2024
The mountainous country, formerly part of the Soviet Union, borders China on the east and south.
—Mathew Miranda, Sacramento Bee, 9 July 2024
See all Example Sentences for mountainous
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'mountainous.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near mountainous
Cite this Entry
“Mountainous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mountainous. Accessed 27 Jul. 2024.
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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