mountainous

From mountain +‎ -ous after Middle French montagneux, from Late Latin montāniōsus, from montānia, from Latin montem (“mountain”).

• (Received Pronunciation, General American) IPA^(key): /ˈmaʊn.tɪn.əs/

• Audio (Southern England):

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• (General Australian, New Zealand; US with weak vowel merger) IPA^(key): /ˈmaʊn.tən.əs/, [ˈmæʊn.tn̩.əs], [-ʔn̩-], [ˈmæ̃ʊ̃(n)-]

mountainous (comparative more mountainous, superlative most mountainous)

1. Having many mountains; characterized by mountains; of the nature of a mountain; rough (terrain); rocky.
   • 1705, George Cheyne, “Of the Existence of a Deity”, in Philosophical Principles of Natural Religion: […], London: […] George Strahan […], →OCLC, § XXIX, page 184:

     [Water vapour bubbles] hit againſt the ſides of the more eminent and Mountainous Places, of the Globe, and by this Concuſſion are condenſed, and thus become heavier than the Air they ſvvom in, and ſo gleet dovvn the rocky Caverns of theſe Mountains, […]

   • 2024, Simon Montlake, In mountainous North Carolina, residents are the first responders after Hurricane Helene, in: The Christian Science Monitor, October 1 2024, headline

     In mountainous North Carolina, residents are the first responders after Hurricane Helene[.]

2. Resembling a mountain, especially in size; huge; towering.
   • 2016 November 28, Mike Vorkunov, “Despite Flash of Rose’s Prime, Knicks Are Dazed by Westbrook and Thunder”, in The New York Times‎^[1]:

     But the added size did not give them an advantage this time. Not when Kanter and Adams, two mountainous players, could match the Knicks’ girth with their own.

3. (figurative, of a problem or task) Very difficult.
4. (obsolete) Inhabiting mountains; hence, barbarous.

• See also Thesaurus:large

• hilly