meaning of "least of all".

[Sonia*]

Good Evening sir,

Please tell me the meaning and proper use of "least of all",I do not know if it is an idiom? Please tell me the difference "she did not mind in the least"
He neither needs certificates from anyone,least of all techers."

Thanks a lot.
sonia*

[Mister Micawber]

Least of all = especially not. It is in the DICTIONARY.

In the least = at all. It is in the DICTIONARY, too.
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Native English teacher at Mister Micawber's

[Sonia*]

thanks a million sir...