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English definition of “nerd”

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nerd

noun [C] uk   /nɜːd/ us    /nɝːd/ informal disapproving
a person, especially a man, who is not attractive and is awkward or socially embarrassing: He was a real nerd in high school - I can't believe he's so handsome now. a person who is extremely interested in one subject, especially computers, and knows a lot of facts about it: I'm a real grammar nerd.
nerdy
adjective uk   /ˈnɜː.di/ us    /ˈnɝː-/ informal disapproving
He's nice, but kind of nerdy. These glasses make me look/feel nerdy.
(Definition of nerd from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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