mountainous
adjective
moun·tain·ous ˈmau̇n-tə-nəs 
ˈmau̇nt-nəs
1
: containing many mountains
2
: resembling a mountain : huge
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
See all Synonyms & Antonyms 
Example Sentences
the seemingly mountainous obstacles he had to overcome while growing up
Recent Examples on the Web Winds could gust over 60 mph as the wind flow around the storm begins to interact with the mountainous terrain of Southern California. 
Nouran Salahieh, CNN, 8 Sep. 2022 The rolling turquoise waves and mountainous terrain of Oahu looks nearly identical to the Azores region of Portugal. Lauren Smith Mcdonough And Janaya Wecker, House Beautiful, 1 Sep. 2022 Two companies born in the Rocky Mountains, BOA Technology and Altra are natural collaborators and innovators focused on addressing the unique needs of mid- to long-distance runners taking on mountainous terrain. Outside Online, 29 Aug. 2022 Greek authorities say higher fuel costs have added to challenges facing the fire service, which relies heavily on water-dropping planes to battle blazes in the mountainous country. Demetris Nellas, ajc, 2 July 2022 What made researchers dig into the graves of the mountainous landlocked country? Natalie Neysa Alund, USA TODAY, 16 June 2022 Once part of the Kingdom of Piedmont-Sardinia, this mountainous island's cuisine remains distinct from mainland Italy. Jen Rose Smith, CNN, 4 May 2022 Shackleton and two others then crossed the mountainous island to the whaling station at Stromness. Michael Verdon, Robb Report, 9 Mar. 2022 The lush mountainous island is in the Lesser Antilles, south of Anguilla and west of Antigua. Johanna Read, Forbes, 23 Dec. 2021 See More
Nouran Salahieh, CNN, 8 Sep. 2022 The rolling turquoise waves and mountainous terrain of Oahu looks nearly identical to the Azores region of Portugal. Lauren Smith Mcdonough And Janaya Wecker, House Beautiful, 1 Sep. 2022 Two companies born in the Rocky Mountains, BOA Technology and Altra are natural collaborators and innovators focused on addressing the unique needs of mid- to long-distance runners taking on mountainous terrain. Outside Online, 29 Aug. 2022 Greek authorities say higher fuel costs have added to challenges facing the fire service, which relies heavily on water-dropping planes to battle blazes in the mountainous country. Demetris Nellas, ajc, 2 July 2022 What made researchers dig into the graves of the mountainous landlocked country? Natalie Neysa Alund, USA TODAY, 16 June 2022 Once part of the Kingdom of Piedmont-Sardinia, this mountainous island's cuisine remains distinct from mainland Italy. Jen Rose Smith, CNN, 4 May 2022 Shackleton and two others then crossed the mountainous island to the whaling station at Stromness. Michael Verdon, Robb Report, 9 Mar. 2022 The lush mountainous island is in the Lesser Antilles, south of Anguilla and west of Antigua. Johanna Read, Forbes, 23 Dec. 2021 See More Word History
Etymology
Middle English mounteynous, borrowed from Anglo-French muntaignus, from muntaigne, mountaigne mountain + -us -ous
First Known Use
14th century, in the meaning defined at sense 1
Kids Definition
mountainous
adjective
moun·tain·ous ˈmau̇n-tə-nəs
1
: having many mountains
mountainous country
2
: like a mountain in size : huge
a mountainous pile
mountainous
adjective
as in vast
unusually large the seemingly mountainous obstacles he had to overcome while growing up Synonyms & Similar Words
Relevance
- vast
- gigantic
- huge
- enormous
- massive
- giant
- tremendous
- colossal
- mammoth
- immense
- astronomical
- monumental
- monstrous
- oceanic
- mighty
- sizable
- titanic
- big
- bumper
- monster
- astronomic
- gargantuan
- heroic
- oversize
- majestic
- humongous
- prodigious
- cosmic
- great
- grand
- super
- galactic
- planetary
- elephantine
- mega
- cyclopean
- herculean
- Himalayan
- substantial
- heroical
- vasty
- considerable
- leviathan
- oversized
- humungous
- walloping
- formidable
- handsome
- pharaonic
- jumbo
- cosmical
- whopping
- extensive
- gigantesque
- overgrown
- voluminous
- supersized
- good
- whacking
- staggering
- hulking
- bulky
- imposing
- major
- lofty
- cavernous
- goodly
- infinite
- grandiose
- Brobdingnagian
- largish
- outsize
- king-sized
- supersize
- super-duper
- overwhelming
- gross
- tidy
- stupendous
- king-size
- towering
- hefty
- sizeable
- monolithic
- outsized
- august
- immeasurable
- boundless
Antonyms & Near Antonyms
- tiny
- diminutive
- minuscule
- microscopic
- miniature
- small
- infinitesimal
- microscopical
- bitty
- micro
- pygmy
- teeny
- pocket
- wee
- little bitty
- smallish
- puny
- teensy
- midget
- little
- petite
- minute
- bantam
- undersized
- mini
- undersize
- microminiature
- dwarfish
- dinky
- teeny-weeny
- teensy-weensy
- Lilliputian
- pint-sized
- pint-size
- half-pint