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acting in an way that may potentially have negative effect on other people without forethought or understanding.
"It was naivil of him to tell you how totally overjoyed he is about your ex's new fiance."
"Yeah, he has no idea that we broke up because she was commitment-phobic. sigh."
"Hey, try to have fun anyways, hey?"

or

It was naievil of her to grind on Henry; doesn't she know I've had a crush on him since third grade?? argh!
by Margarina Cataclysma October 12, 2009
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