The adjectives for the noun or verb change include the present and past participles: changing and changed (as well as the negatives, unchanging and unchanged). A related adjective is the derivative changeable.
The adjective form is enigmatic.
fame
indignation
The suffix -ous is added to the noun mountain to form the adjective mountainous.
The proper adjective for Antarctica is Antarctic, as in Antarctic Circle.
Norway is a proper noun, not an adjective. It is the name of a country. It does not change.
The adjective form is enigmatic.
Occasional
indignation
fame
catastrophic
Leisure is already in its adjective form. It does not change between noun and adjective, only between noun/adjective and adverb. "Please complete this at your leisure." = noun "My favorite leisure activity is golf." = adjective "He completed the task leisurely." = adverb
It is Technical
Korean
indignation
tendency
Cultural