mountainous

adj

1. Having many mountains; characterized by mountains; of the nature of a mountain; rough (terrain); rocky.

   “[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, […]”

   “The mountainous nature of Norway has always been a serious obstacle to the development of railways, and although some 2,700 route miles are now open for traffic, several schemes have yet to be completed.”

   “While the physical and human toll now is likely to be lower, the mountainous terrain and dispersed population make the response to Helene tough to manage and could slow the transition to a recovery phase, after power and other services are restored.”

2. Resembling a mountain, especially in size; huge; towering.

   “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. (figuratively)Very difficult.

   “As Brazil faced the mountainous task of completing an Olympic venue before the opening ceremony, Chinese netizens got busy molehilling a remark by a Rio construction manager about their China supplier.”

4. (obsolete)Inhabiting mountains; hence, barbarous.