A guy being "too serious" to the point of being a turn-off...

...girls, can you describe a situation when a guy you met was "too serious", to the point of it being a turn-off? I know that every girl has probably experienced one of these dudes before.

To me, the idea of a guy being "too serious" is something that I haven't heard defined by girls on this website. So I'm asking for input.

Thank you. :)
A guy being "too serious" to the point of being a turn-off...
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