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Not much at all; very little. A: "What did you learn at school today?" B: "Nothing much, we just reviewed times tables all day." I'm sorry to tell you that there's nothing much to do around here except watch the trains go by.
Inf. not much; hardly anything; nothing of importance. (Often a reply to a greeting asking what one has been doing.) John: Hey, man! How's by you? Bob: Hiya! Nothing much. Bill: What have you been doing? Tom: Nothing much.