an adjective is a word that describes or modifies a noun or pronoun. In this case, 'obvious' is being used as an adjective to describe or modify a noun, such as 'The obvious difference.'.
might be used with adverbs such as 'very' or 'extremely'.
1. His obvious anger was frightening.
2. There was an obvious lack of enthusiasm.
3. It was an obvious mistake.
be aware that the adjective 'obvious' carries the risk of sounding blunt or patronizing.