For "nerd" the German language has a lot of designations:
"Streber" if it's a boy, and "Streberin" if it's a girl,
or
"Außenseiter" for a boy, "Außenseiterin" for a girl.
Also the term "Langweiler" or "Langweilerin" is appropriate
Nerd = Streber
Sie ein Nerd bist
You can either say 'Nerd' or CDF (in Brazil)
nerd is not a language
In Yiddish, the word "Nebish" means an awkward person, or nerd.
"Nerd" in Polish is "maniak komputerowy" or "nieudacznik."
OK, here it is: Vous êtes un nerd.
otaku
You can say "nerd" which is part of Spanish slang also.Another word was empollón / empollóna to mean someone over-studious.
Vous crétin
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You can either say 'Nerd' or CDF (in Brazil)