Phrasals: by all means, by no means / not by any means / not by any manner of means

by all means!

(spoken) used to mean ‘of course’ when politely allowing someone to do something or agreeing with a suggestion.

of course.

used to give permission. used for politely agreeing with someone, giving permission, or saying ‘yes’

‘Can I bring Alan?’ ‘By all means!’

By all means feel free to get a second opinion.

by no means / not by any means / not by any manner of means

in no way. not at all.

It is by no means certain that the game will take place.

She’s not a bad kid, by any means.

It's by no means certain that he'll come. = It's not by any means certain that he'll come.

This is by no means the first time we have had this problem.

I was not happy about the arrangements by any means, but I agreed to do it.

This issue has not been resolved yet by any manner of means.