not one whit
old-fashioned Not at all or in any way. We are not concerned about the investigation—not one whit. We have nothing to hide. A: "Do you mind if I tag along this afternoon?" B: "Not one whit!"
not a/one ˈwhit
(old-fashioned) not at all; not the smallest amount: The party leaders care not a whit about the principles of democracy and freedom.