couldn't have cared less

Maximally without concern

Couldn't have cared less means complete indifference—caring was already at zero, so it couldn't go lower: She couldn't have cared less what they thought of her outfit.

The phrase is often shortened to could care less, which logically means the opposite but functions identically.

Both versions signal dismissive unconcern.

Related

don't care · neutrality · whatever · stoicism · dismissal · resignation · meh · zero interest · ennui · water off a duck's back · let it go · couldn't care less · don't give a damn · nonchalance · ambivalence · detachment · flippancy · big deal

Opposites
degree of caring/investment

couldn't have cared lesstook to heart

Absorbed emotionally, personally

gave a damn

emotional intensity/passion

couldn't have cared lesswrapped up in

Family

could, cared, cares, careful, carefully, careless, carelessly, carelessness, carefree

Familiarity
Top 50,000
Profile
Known to kids · Used worldwide · Timeless · Abstract · Negative · Everyday, not technical · Rated G