didn't care a whit
care a whit
To care just the smallest amount. (A "whit" is an iota.) Often used in the negative. I don't care a whit what the neighbors say, I'm not taking that fence down! Does Elsa care a whit about our plans? No, I don't think she does! I don't care a whit what her excuse is—we need those flowers by 11:00 AM, and that's final.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
didn't care a whit
and don't care a whitdidn't care at all. Sally thought Joe liked her, but he didn't care a whit about her. I don't care a whit what you do with my old clothes.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.