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Here are some:
I saw an obvious [I Understood] cat in the city.
You have Obvious [Recognized] Ideas.
I see a little bug with a magnifying glass obviously [Easily].
manifest destiny
The adjective of "obvious" is "obvious."
This seems to have an obvious answer.
The answer was obvious to all present.
No, the word 'obvious' is not a noun.
The word 'obvious' is an adjective, a word used to describe a noun.
The abstract noun form of the adjective obvious is obviousness.