mountainous

US /ˈmaʊn.tən.əs/

UK /ˈmaʊn.tən.əs/

1.

having many mountains

:

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The region is very mountainous, making travel difficult.

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They hiked through the rugged, mountainous terrain.

:

hilly alpine craggy rugged elevated

2.

very large; enormous

:

•

He faced a mountainous task of clearing the entire forest.

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There was a mountainous pile of laundry to do.

:

huge massive gigantic colossal immense

:

mountain mountain range mountain biking mountain lion mountain bike move mountains Bernese mountain dog