at all
at all with a negative
We often use at all to emphasise a negative idea.
- I didn’t understand anything at all. (= I didn’t understand even a little.)
- She was hardly frightened at all.
Questions, etc
At all can also be used in questions, and with ‘non-affirmative’ words like if, ever and any.
- Do you play poker at all? (= … even a little?)
- He’ll come before supper if he comes at all.
- You can come whenever you like – any time at all.
Not at all.
The expression Not at all is used (especially in British English) as a rather formal answer to Thank you (see here) and to Do you mind if …? (see here).