How to Say "preconceived notion" in Spanish
The Spanish word for “preconceived notion” is “prejuicio” — B1 level. This is a very common word in everyday Spanish.

Examples
No debemos tener prejuicios contra las personas que no conocemos.
We shouldn't have prejudices against people we don't know.
Es difícil dejar de lado nuestros prejuicios personales.
It is hard to set aside our personal biases.
La película rompe con los prejuicios sociales de la época.
The movie breaks with the social prejudices of the time.
Always Masculine
Even though it ends in 'o', remember to always use masculine words with it, like 'un prejuicio' or 'el prejuicio'.
Using it with Verbs
In Spanish, we usually say someone 'has' prejudices (tener prejuicios) or 'acts' based on them, similar to English.
The 'Perjuicio' Trap
Mistake: “Using 'perjuicio' when you mean 'bias'.”
Correction: Use 'prejuicio' for opinions. 'Perjuicio' actually means 'harm' or 'damage'. They sound very similar!
Related Translations
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