The suffix -ous is added to the noun mountain to form the adjective mountainous.
The adjective form is enigmatic.
fame
Oh, dude, totally! "High" can totally be an adjective. You can say, "I feel high," or "That mountain is really high." So, like, yeah, it's an adjective.
indignation
Agape is a noun meaning God's love for mankind. But English can use nouns as adjectives. Mountain is a noun but can be used as an adjective as in "The mountain pass is wide." So we can say "Agape love is the highest form of love."
The adjective for the word "mountain" is "mountainous".
The word mountain can be used as an adjective. You might have a mountain bike, or mountain gear, or you might hike a mountain pass or trail.
Mountain is a predicate noun.
The adjective is "front".
Norway is a proper noun, not an adjective. It is the name of a country. It does not change.
Mountain in the noun form is used for many constructions (mountain cabin, mountain man) but the adjective (of, like, or an aspect of mountains) is mountainous.
The adjective form is enigmatic.
It would most likely be an adjective prepositional phrase because it will modify a noun.
Blue mountain is a proper noun, as it refers to a place and also to a company.
adverb phrase
You can change the adjective "arrogant" into a noun by adding the suffix "-ce" to form the noun "arrogance."
To change "recent" into an adjective, you can add the suffix "-ly" to make it "recently."