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Re:Ask HN: What's a polite way to say “I'm not interested” a... by digisth on Friday March 27, 2015 @02:14PM (#9278077)
"I don't think the position is the right fit. Thank you for your time" has worked out well for me.
Re:Ask HN: What's a polite way to say “I'm not interested” a... by watmough on Friday March 27, 2015 @05:19PM (#9279063)
Most of these answers are good, but this is the best one.

Keep it short and sweet.