Deep down, I'm pretty superficial.

Deep down, there is in the substance of the cosmos a primordial disposition, sui generis, for self-arrangement and self-involution.

Deep down, I happen to be very shallow.

Deep down, I'm just a West Virginia hillbilly.

There is nothing deep down inside us except what we have put there ourselves.

I fantasize and idealize myself as Bugs Bunny, but I know deep down I'm Daffy Duck.