couldn't care less

couldn't care less idiom
Also, could care less. Be completely indifferent. For example, Pick whatever dessert you want; I couldn't care less, or I could care less about the editor's opinion. This expression originated about 1940 in Britain and for a time invariably used couldn't. About 1960 could was occasionally substituted, and today both versions are used with approximately equal frequency, despite their being antonyms.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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