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

Synonyms & Similar Words

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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 The uneven elevation of Spain’s mountainous regions could obstruct viewing the eclipse, as could a line of trees or a smattering of buildings. — Catherine Tansey, Condé Nast Traveler, 17 July 2026 By Sunday, the most dangerous conditions will likely be in Minnesota and Wisconsin, with pockets of marginally unhealthy locations in the mountainous regions of the Mid-Atlantic. — Marshall Shepherd, Forbes.com, 17 July 2026 The biggest wildfire is raging in the Pyrénées, prompting organizers of the famed Tour de France road cycling race, which started on Saturday in Barcelona, Spain, to ban spectators from lining the route in the mountainous region. — Bill Hutchinson, ABC News, 8 July 2026 Small and slender, with an average length of about two feet, it is found in the mountainous areas of West Texas. — Mateo Rosiles, USA Today, 6 July 2026 See All Example Sentences for mountainous

Recent Examples of Synonyms for mountainous

Adjective

DeepSeek challenged the conventional wisdom that developing an advanced AI model requires massive financial investment and vast computing power, and offered competitive pricing.

— John Liu, CNN Money, 24 July 2026
Tech firms are now addressing this blind spot, deploying AI to analyze vast backlogs of inspection photos and notes, identifying defects like corrosion.

— Dara-Abasi Ita, Forbes.com, 23 July 2026

Definition of vast

Adjective

The designation is a first for Georgia and a huge win for dedicated conservationists, scientists, government officials, nonprofits and swamp neighbors who have spent more than four decades advocating for our wetland wonder.

— AJ Willingham, AJC.com, 27 July 2026
Jericho hit Ciampa with the hockey stick and kissed the Youppi the plush toy to a huge pop.

— Alfred Konuwa, Forbes.com, 27 July 2026

Definition of huge

Adjective

The two lakes, which are essentially one gigantic reservoir separated by the Grand Canyon, hold just under 60% of the total water currently stored in the basin.

— Laura Paddison, CNN Money, 22 July 2026
Also seen is Edric’s sinister pod sliding silently into one of the gigantic Guild Heighliner starships.

— Jeff Spry, Space.com, 22 July 2026

Definition of gigantic

Adjective

This period, known as the Paleocene-Eocene Thermal Maximum and first noted in the 1990s, may have been the result of an enormous volcanic eruption, or maybe a sudden release of methane.

— Laura Paddison, CNN Money, 25 July 2026
That’s an enormous sales figure for any current release, let alone a project that arrived more than a decade ago.

— Hugh McIntyre, Forbes.com, 25 July 2026

Definition of enormous

Adjective

Balloons float above an exploding castle, a giant peeks from behind the bushes and wizards throw flames in the foreground.

— Phillip Molnar, San Diego Union-Tribune, 24 July 2026
An interesting implication of the spillover effect is that the end customers of consumer electronics devices are now effectively competing against giant data centers.

— Srikanth Jagabathula, Fortune, 24 July 2026

Definition of giant

Adjective

Multiple people were injured Thursday after a Kenmore Air floatplane made an emergency landing off the Washington coast before catching fire, prompting a massive rescue operation, authorities said.

— Michael Sinkewicz, FOXNews.com, 24 July 2026
DeepSeek challenged the conventional wisdom that developing an advanced AI model requires massive financial investment and vast computing power, and offered competitive pricing.

— John Liu, CNN Money, 24 July 2026

Definition of massive

Adjective

The colossal billboards by the side of highways advertising legal representation.

— Nick Miller, New York Times, 18 July 2026
This week, Gracie Abrams pens a tearjerker on mother-daughter relationships, Steve Lacy escapes the abyss of a breakup on a colossal double track, and Beabadoobee contemplates risk and reward on a fuzzy new single.

— Rolling Stone, Rolling Stone, 17 July 2026