What does "Not at all" mean?

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Hi,

It means eg. it does not matter; it is not important.

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I see it more often as a very emphatic NO! (:

"Do you like this movie?"
"Not at all! It's so boring."

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It emphasizes 'NO',

A: Do you like James?
B: No
A: You Don't?
B: No, not at all.

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What immediately came to mind for me was:

- "Would you mind if I ..." (any reasonable proposal)
- "No, not at all."

By saying "not at all", the person indicates he/she really doesn't mind what's being proposed, putting the requester at ease. As Ellie said, a very emphatic no.

Another good similar phrase: "absolutely not".

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You could use 'not a bit' OR 'not (one) little bit' OR 'not in the slightest' instead of 'not at all'