adjective
having qualities or characteristics associated with geeks, such as being knowledgeable or obsessed with a particular subject
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His geekish tendencies were evident in his extensive knowledge of computer programming languages.
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She has a bit of a geekish side when it comes to collecting comic books.
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I didn't realize how geekish he was until I saw his massive collection of action figures.
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Her love for obscure indie films gives her a geekish aura among her friends.