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 Ramping oil output is the ticket to restructuring Venezuela’s mountainous $250 billion debt load, equal to roughly 150% of GDP, the highest number in Latin America and fourth in the world. — Shawn Tully, Fortune, 20 Aug. 2026 For generations, the idea of building physical border barriers in the Big Bend region was thought unnecessary because of the harsh, mountainous landscape that naturally limited migrant traffic. — Ashley Killough, CNN Money, 19 Aug. 2026 To explore Great Basin above ground, hit the 12-mile Wheeler Peak Scenic Drive, a mountainous road winding up to 10,000 feet of elevation, with trails, lakes, and pine groves to admire along the way. — Stephanie Vermillion, Travel + Leisure, 18 Aug. 2026 Fans of the History Channel will love a stay in Stockbridge, where a picturesque small town highlights the history of the mountainous region. — Shannon Sharpe, Architectural Digest, 18 Aug. 2026 See All Example Sentences for mountainous

Recent Examples of Synonyms for mountainous

Adjective

The Mexican navy searched a vast area of the Pacific Ocean by sea and air, eventually finding the two men floating in a large fishing cooler about 150 miles off the coast of Chiapas, a southern state in Mexico that borders Guatemala.

— Diego Mendoza, CNN Money, 21 Aug. 2026
Masanori Kumagai/Kyodo News via AP Hiraguchi cited surveys showing the vast majority of Japanese supporting the death penalty as an unavoidable option.

— CBS News, CBS News, 21 Aug. 2026

Definition of vast

Adjective

Kneeling beside the fallen buck, Charles, an avid trophy bowhunter, ran his hands over the gigantic rack.

— Jeff Murray, Outdoor Life, 20 Aug. 2026
Lakes Mead and Powell, which are essentially one gigantic reservoir separated by the Grand Canyon, hold just under 60% of the total watercurrently stored in the Colorado River basin.

— Laura Paddison, CNN Money, 16 Aug. 2026

Definition of gigantic

Adjective

Tucker is being counted on as a middle-of-the-order presence, but the enormous contract has made every prolonged downturn more difficult to ignore.

— Peter Chawaga, Forbes.com, 22 Aug. 2026
The researchers argue that the enormous cliff system triggered prolonged erosion that stripped away vast amounts of rock and helped expose some of North America’s oldest geological formations.

— Kaif Shaikh, Interesting Engineering, 21 Aug. 2026

Definition of enormous

Adjective

Hardware rich… Engineers have reams of data from all 13 test flights of Starship and its giant booster rocket, known as the Super Heavy.

— Stephen Clark, ArsTechnica, 21 Aug. 2026
Returning and reflying both Starship stages is a key component in SpaceX's design for the giant rocket, which will be the largest, most powerful launch vehicle in history once the company works out all its kinks.

— Josh Dinner, Space.com, 21 Aug. 2026

Definition of giant

Adjective

According to a new study published in Geology, the massive escarpment formed around 800 million to 750 million years ago as the ancient supercontinent Rodinia began to break apart.

— Kaif Shaikh, Interesting Engineering, 21 Aug. 2026
Coach Keidane McAlpine hopes the Bulldogs, who dominated from start to finish on a massive stage, left a lasting impression.

— Sarah Spencer, AJC.com, 21 Aug. 2026