ˈmau̇nt( ə )nəs, -tə̇n- adjective
Etymology: mountain (I) + -ous
1. : characterized by mountains
turn eastward into the mountainous Vermont wilderness — Budd Schulberg
2. : resembling a mountain : huge , gigantic
rescued from the mountainous seas — News from New Zealand
seemed slender beside that mountainous woman — Ann Bridge
3. obsolete : leading a primitive life in an inaccessible mountain region
this wild mountainous people — Samuel Purchas
4. archaic : mountain 2a
the ash and other mountainous trees — Richard Warner
• moun·tain·ous·ly adverb