1. (a.) Full of, or containing, mountains; as, the mountainous country of the Swiss\.

2. (a.) Inhabiting mountains.

3. (a.) Large as, or resembling, a mountain; huge; of great bulk; as, a mountainous heap.

Atlantean Brobdingnagian Cyclopean Gargantuan Herculean Homeric abysmal alpen alpestrine alpigene alpine amplitudinous astronomic astronomical awesome boundless bulky colossal cosmic craggy elephantine enormous epic extensive formidable galactic giant giantlike gigantic heroic high hilly huge immeasurable immense infinite jumbo king-size knobby large mammoth massive massy mighty monster monstrous monticuline monumental mountained outsize overgrown prodigious profound rolling sizable spacious staggering steep stupendous subalpine titanic towering tremendous vast voluminous weighty