not (in) the least
Definition of not (in) the least
: not at all : not in any way or respect It did not interest me in the least. That joke was not in the least funny. I'm not the least worried.
Word by Word Definitions
: superlative of1little
: lowest in importance or position
: smallest in size or degree
: one that is least
: superlative of2little
: in the smallest or lowest degree
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