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The noun form of mysterious is "mystery."
No, the word 'mysterious' is not a noun.The word 'mysterious' is an adjective, a word used to describe a noun.Example: A mysterious package came for you today.The noun form of the adjective 'mysterious' is mysteriousness.The word 'mysterious' is the adjective form of the noun mystery.
The possessive form of the noun scientist is scientist's.Example: The scientist's notes were a jumble of mysterious scribbles.
The possessive form of the noun scientist is scientist's.Example: The scientist's notes were a jumble of mysterious scribbles.
The noun form for the adjective austere is austereness. Another noun form is austerity.
noun = mud The noun form for the adjective muddy is muddiness.