Meaning of “not at all” in the English Dictionary

british dictionary

"not at all" in British English

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not at all

B1 used as a polite reply after someone has thanked you:

"Thanks for helping." "Not at all."

B2 used to say "no" or "not" strongly:

"I hope it wasn't too much hassle for you." "No, not at all."
I'm not at all happy about it.

(Definition of “not at all” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"not at all" in American English

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not at all

I do not mind:

"Do you mind if I sit here?" "Not at all."
Note: Used to answer a question.

(Definition of “not at all” from the Cambridge Academic Content Dictionary © Cambridge University Press)