know little and care less

know little and care less (about someone or something)

To have very little 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 little and cared less about what happens to me."
See also: and, care, know, less, little, someone

know little (or nothing) and care less

be completely unconcerned about something; be studiously ignorant.
See also: and, care, know, less, little
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