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English definition of “not at all”

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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 Learners Dictionary & Thesaurus © Cambridge University Press)
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