1

I know,

Can't agree more.

I want to say someone's answer is awsome. I think nobody can give a greater answer. Can I say

Can't greater more

2

You want to use an adjective as a verb which is not going to work this way.

  • This is a brilliant answer
  • This cannot be any better
  • I cannot be any more appreciated

These can be used in that situation. However, choosing a sentence can have many different answers.

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