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Nerd

A nerd is a person seen as overly intellectual, obsessive, introverted, or lacking social skills. Such a person may spend inordinate amounts of time on unpopular, little known, or non-mainstream activities, which are generally either highly technical, abstract, or relating to niche topics such as science fiction or fantasy, to the exclusion of more mainstream activities.

https://en.wikipedia.org/wiki/Nerd