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least of all

 - 2 dictionary results
least   (lēst)   
adj.   A superlative of little.
  1. Lowest in importance or rank.

    1. Smallest in magnitude or degree.

    2. Slightest or tiniest: didn't care the least bit.

adv.   Superlative of little.
To or in the lowest or smallest degree.
n.  One that is the lowest or smallest in importance, rank, magnitude, or degree: The dinner menu is the least of my worries tonight. The least you can do is to be polite.

[Middle English, from Old English lǣst; see leis-2 in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Idioms & Phrases

least of all

Especially not. For example, No one cared, least of all the manager, or None of them will attend, least of all Jim. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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