Formal/Neutral:
* Mól książkowy (Bookworm): This is the most common and neutral term, emphasizing a love for reading and learning.
* Inteligent (Intelligent): This is a general term for someone who is intelligent, but it doesn't necessarily imply being a nerd.
Informal/Slang:
* Kuc (This is a slang term that can be considered offensive in some contexts, and it's not always accurate. It's best to avoid using it unless you're very familiar with Polish slang and the context.)
* Gierczak (Gamer): This term specifically refers to someone who spends a lot of time gaming, which could be considered a type of nerdiness.
* Fantastyka (Fantasy): This refers to someone who is passionate about fantasy genres like sci-fi, fantasy, or comics.
The best translation depends on the context and the specific type of nerd you're talking about. For example, if you're talking about someone who loves science, "mól książkowy" might be the best option. If you're talking about a gamer, "gierczak" would be more appropriate.
It's always a good idea to check the context and choose the most appropriate term based on the situation.