mountainous.
Having many mountains; characterized by mountains; of the nature of a mountain; rough (terrain); rocky.
Meaning & usage
Having many mountains; characterized by mountains; of the nature of a mountain; rough (terrain); rocky.
Resembling a mountain, especially in size; huge; towering.
Very difficult.
Inhabiting mountains; hence, barbarous.
Where this word comes from
From mountain + -ous after Middle French montagneux, from Late Latin montāniōsus, from montānia, from Latin montem (“mountain”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.