MOUNTAINOUS Synonyms: 123 Similar and Opposite Words

mountainous

adjective

ˈmau̇n-tə-nəs

Definition of mountainous

as in vast

unusually large the seemingly mountainous obstacles he had to overcome while growing up

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Example Sentences

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.

Recent Examples of mountainous Meteorites come down all around the planet, but Antarctica’s blue-ice areas, which comprise about 1% of Antarctica’s surface ice, often in mountainous regions, are among the best places to look. — Daniella McCahey, The Conversation, 12 Oct. 2026 Jean Massillon, who became a prominent voice against gang violence after his mountainous enclave became a battleground in Haiti’s raging violence, has died, the country’s central government announced on Friday. — Jacqueline Charles, Miami Herald, 10 Oct. 2026 The hotel itself is perched on the edge of the mountainous Arashiyama forest, a verdant expanse with a profound, serene quiet that seems to wrap around the entire property. — Noah Kaufman, Bon Appetit Magazine, 7 Oct. 2026 Two weeks into fighting, the unforgiving mountainous terrain, heavy Saudi and government air power, and a reenergized anti-Houthi coalition have kept the Houthi advance in check, preventing a collapse on the level of that in mid-September. — Brady Knox, The Washington Examiner, 4 Oct. 2026 See All Example Sentences for mountainous

Recent Examples of Synonyms for mountainous

Adjective

Deep-sea mining companies are targeting this vast reserves of metal-rich nodules to power the electric vehicle market.

— Mrigakshi Dixit, Interesting Engineering, 14 Oct. 2026
China has stepped up cooperation with Southeast Asian nations to crack down on a vast industry that has flourished in the region in recent years to fleece people out of billions of dollars.

— CBS News, CBS News, 13 Oct. 2026

Definition of vast

Adjective

The Board leverages the visual engagement potential of a gigantic iPad with the appealing tactility of board games.

— Kevin Cortez, Time, 15 Oct. 2026
M'Baku is the leader of the Jabari tribe, a Wakandan community that worships a gigantic white gorilla deity.

— Sohini Sarah Pillai, The Conversation, 14 Oct. 2026

Definition of gigantic

Adjective

With the enormous distractions and investments in college sports now removed, our institutions of higher learning can focus on their only mission, and that is providing the best, most affordable education on earth for our young people.

— Bruce Svare, Sportico.com, 17 Oct. 2026
Its nuclear reactor gives it enormous endurance without needing to surface or snorkel to operate diesel engines.

— Christopher McFadden, Interesting Engineering, 17 Oct. 2026

Definition of enormous

Adjective

The most direct tribute to Tippett came in the battle against two giant droids guarding an overlord’s chamber.

— Davide Abbatescianni, Variety, 16 Oct. 2026
The giant company now called Skydance Media made some commitments to the indie film space in a settlement with a group of Attorneys General who had sued to block the merger.

— Jill Goldsmith, Deadline, 15 Oct. 2026

Definition of giant

Adjective

Throw in a third massive object, though, and the math gets ridiculously more complicated and difficult to solve.

— Phil Plait, Scientific American, 16 Oct. 2026
Wearing impractical stilettos and clutching a massive Stanley cup, Trina is introduced to her new pupils.

— Aramide Tinubu, Variety, 15 Oct. 2026

Definition of massive

Adjective

Last-minute changes and unscheduled requests to cover other clients can place tremendous stress on the field caregiver.

— Colin Conner II, Forbes.com, 16 Oct. 2026
There has been a tremendous amount of recent development in Chelsea, but, ever the story in New York City, as beloved old places close their doors, new favorites emerge.

— The New Yorker, New Yorker, 16 Oct. 2026

Definition of tremendous

Adjective

The situation is particularly dire given the film’s colossal budget, which totaled around $180 million.

— Lou Gomis, Vanity Fair, 14 Oct. 2026
The Vikings avoided a colossal mistake in the fourth quarter when Justin Jefferson's throwback near midfield was nearly swiped by the Saints.

— CBS News, CBS News, 13 Oct. 2026