At bottom, basically. For example, Deep down she was a rebel, or Although he would never admit it, deep down he was very fond of her. [c. 1900]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use deep down in a sentence
At least in part because they also know deep down that things like an infrastructure bank are what will really create jobs.
Republicans know the truth about these proposals deep down, or I think most do (I suppose some actually are that dumb).
I had decided not to receive my Confirmation, and had guilt dreams about it but, deep down, felt my decision was the right one.When Gary Wright Met George Harrison: Dream Weaver, John and Yoko, and More | Gary Wright | September 29, 2014 | THE DAILY BEAST
deep down, a lot of them still hope for enough American military intervention that they can win a military victory.
deep down, we probably all wish we were lucky enough to be in the movies.Amateur Stuntmen, the iPhone 6, and More Viral Videos | Jack Holmes | August 30, 2014 | THE DAILY BEAST
Somehow, I knew deep down in my own heart, ill versed as I was in such things, that I should never send her such a gift myself.The Soldier of the Valley | Nelson Lloyd
But I also know that there's something deep down in that man's soul that calls to something deep down in mine.Three More John Silence Stories | Algernon Blackwood
Besides, deep down in her heart—as in father John's—lay a feeling of wounded pride.Dorothy at Skyrie | Evelyn Raymond
He saw all that, and he saw the sleeping tenderness in her eyes; deep-down it slept, under dark blue veils.The Creators | May Sinclair
She too hides somewhere, deep down, a poor fettered thing that would gladly join the revel, if it dared.The Daughters of Danaus | Mona Caird