Mountainousness vs. Mountainous

The quality of being mountainous.

Having many mountains.

The state or quality of being mountainous.

Resembling a mountain in size; huge

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

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

Very difficult.

(obsolete) Inhabiting mountains; hence, barbarous.

Full of, or containing, mountains; as, the mountainous country of the Swiss.

Inhabiting mountains.

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

Having hills and crags;

Like a mountain in size and impressiveness;

Containing many mountains