Etymology
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mountainous (adj.)

late 14c., mounteinous, "abounding in or characterized by mountains," from mountain + -ous or else from Medieval Latin montaniosus, from Vulgar Latin *montaneosus "mountainous," from *montanea.

updated on March 12, 2019

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Definitions of mountainous from WordNet

mountainous (adj.)
having hills and crags;
Synonyms: cragged / craggy / hilly
mountainous (adj.)
like a mountain in size and impressiveness;
mountainous waves
a mountainous dark man
mountainous (adj.)
containing many mountains;
From wordnet.princeton.edu, not affiliated with etymonline.