The adjective form is enigmatic.
youngest
fame
indignation
The suffix -ous is added to the noun mountain to form the adjective mountainous.
Youngest is an adjective.
Norway is a proper noun, not an adjective. It is the name of a country. It does not change.
bustling
The adjective form is enigmatic.
youngest
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