know nothing and care less (about someone or something)

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know nothing and care less (about someone or something)

To have only a passing knowledge and absolutely no concern about someone or something. A: "Don't you have any family who would take you in?" A: "I had a half-brother who lived upstate, but the last time I checked, he knew nothing and cared less about what happens to me." There's no point getting frustrated at the computer. It's just a machine—it knows nothing and cares less about what you want it to do, only what you tell it to do.
See also: and, care, know, less, nothing, someone