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]
Words nearby least of all
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.