nothing could be further from my mind, the truth, etc.
nothing could be further from (something)
What we are discussing is the complete opposite of something. They claim that the tax overhaul was designed with lower- and middle-class earners in mind, but nothing could be further from the truth! Nothing could be further from reality—I have never accepted bribes in my entire career.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ˌnothing could be ˌfurther from my ˈmind, the ˈtruth, etc.used to emphasize that what somebody has said you are thinking is definitely not true: ‘You must be thinking how terrible I look.’ ‘Nothing could be further from my mind. You’re as beautiful as always.’ ♢ People expect the richest people to be the most generous, but in fact nothing could be further from the truth.
Farlex Partner Idioms Dictionary © Farlex 2017