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I cannot say anything 'definite/definitely' about it

which is correct?

I know many people usually use 'definite' in this sentence. I cannot find sentences used 'definitely' in that situation.

is there any reason we couldn't use 'definitely'?

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We use definite as we are describing the thing that we might say:

"It is a black cat" is a definite statement.

"It might a cat or it might not" is not definite.

When you describe a thing, you use an adjective.

It is possible to use an adverb to describe the manner of "say". Compare:

He said something musical (He was talking about music)
He said something musically (He was talking in a singing voice)

But if you are using "definitely" it is better placed before the verb it modifies. Compare:

We cannot definitely say anything about it. (we might say something that is not definite) We definitely cannot say anything about it. (we can't say anything at all)

These have very different meanings.

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"Definite" and "definitely" are two different things. The first is an adjective used to modify some noun:

She said we have definite plans for this evening, so I should come home right after work.

while the second is an adverb used to modify a verb

She said we were definitely going out this evening, so I should come home right after work.

Either of this can work in your example sentence, but it depends what you want to say.

"I cannot definitely say something about it"

= I'm not sure I can say something. (adverb modifying "say")

"I cannot say anything definite about it

= I could say something, but I would not be certain it was valid. (adjective modifying "anything")

In many cases it's a subtle difference that does not really change the meaning:

We don't have an opinion on whether the professor's theory is definitely valid (as we have yet to verify her calculations).

We have no definite opinion on whether the professor's theory is valid (as we have yet to verify her calculations).

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