Meaning of “not the least” in the English Dictionary

british dictionary

"not the least" in British English

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not the least

used for emphasis with nouns:

I haven't the least idea (= I do not know) who he was.
She hasn't the least interest (= she has no interest) in the project.

(Definition of “not the least” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)