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3. I'm not kidding

I'm not kidding

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I'm not kidding.

I am telling the truth.; I am not trying to fool you. Mary: Those guys are all suspects in the robbery. Sue: No! They can't be! Mary: I'm not kidding! John (gesturing): The fish I caught was this big! Jane: I don't believe it! John: I'm not kidding!

See also: kid, not