Use 'not at all' to emphasize a complete lack of possibility or truth in a situation.

Strong Denial

When refusing an offer, 'not at all' softens the response, making it sound more polite.

Gracious Refusal

'Not at all' can be used to correct someone's false beliefs or claims about you.

Use 'not at all' to stress that something does not have even a small amount of the quality mentioned.

To make a negative statement stronger, 'not at all' is your phrase of choice.

'Not at all' can be a humble way to respond to someone's gratitude, suggesting no thanks are needed.

Use it to assure someone that what they're thanking you for was no trouble at all.