How to Say "well-known" in Spanish
The most common Spanish word for “well-known” is “conocido” — use 'conocido' when something or someone is generally recognized or familiar to many people, often implying a degree of fame or notoriety.
conocido
ko-no-SEE-dokonoˈsido

Examples
Es un actor muy conocido.
He is a very well-known actor.
La paella es un plato conocido en todo el mundo.
Paella is a dish known throughout the world.
Este es un hecho bien conocido por los científicos.
This is a fact well known by scientists.
Matching the Noun
Like most Spanish describers, 'conocido' changes to match the person or thing it describes. Use 'conocida' for feminine things (la actriz conocida) and add an 's' for plural things (los actores conocidos, las actrices conocidas).
Using 'Ser', Not 'Estar'
Mistake: “La ciudad está conocida por su comida.”
Correction: La ciudad es conocida por su comida. Use 'ser' (es, son, etc.) with 'conocido' to describe a characteristic or identity, like being famous for something.
famoso
fah-MOH-sohfaˈmoso

Examples
Este es un actor muy famoso.
This is a very famous actor.
La ciudad es famosa por sus vinos.
The city is famous for its wines.
Esa canción se hizo famosa en los años noventa.
That song became famous in the nineties.
Adjective Agreement
Since 'famoso' is an adjective, it must change its ending to match the thing it describes (the noun). Use 'famoso' for masculine singular, 'famosa' for feminine singular, 'famosos' for masculine plural, and 'famosas' for feminine plural.
Forgetting Agreement
Mistake: “Las cantantes famoso.”
Correction: Las cantantes famosas. (Since 'cantantes' is plural and feminine, 'famoso' must also be plural and feminine.)
popular
poh-poo-LAHRpo.puˈlaɾ

Examples
Esa banda de música se hizo muy popular en España.
That music band became very popular in Spain.
Es un destino turístico muy popular durante el verano.
It is a very popular tourist destination during the summer.
La comida rápida es popular por ser barata y rápida.
Fast food is popular because it is cheap and quick.
Adjective Form
As an adjective, 'popular' is the same whether you are describing a masculine person/thing (el libro popular) or a feminine person/thing (la canción popular). It only changes for the plural: populares.
sabido
sah-BEE-dohsaˈβi.ðo

Examples
Ese es un hecho muy sabido por todos en la oficina.
That is a very well-known fact by everyone in the office.
Dicen que el nuevo jefe es muy sabido y no se le escapa nada.
They say the new boss is very cunning, and nothing gets past him.
La respuesta ya era sabida por la audiencia.
The answer was already known by the audience.
Adjective Agreement
As an adjective, 'sabido' must match the thing it describes in both gender (masculine/feminine) and number (singular/plural): sabido (m. sing.), sabida (f. sing.), sabidos (m. plural), sabidas (f. plural).
Confusing 'Known' Meanings
Mistake: “Using 'sabido' to mean 'a person I know well' (e.g., *un amigo sabido*).”
Correction: Use 'conocido' for 'acquaintance' or 'familiar person.' 'Sabido' usually refers to facts or shrewd character traits.
notorio
no-TO-ryonoˈtoɾjo

Examples
Hubo un cambio notorio en su actitud después de las vacaciones.
There was an obvious change in his attitude after the vacation.
Es un hecho notorio que la ciudad ha crecido mucho.
It is a well-known fact that the city has grown a lot.
La falta de personal es notoria en este hospital.
The lack of staff is evident in this hospital.
Matching the Noun
Since this is an adjective, it must match the gender of the thing it describes. Use 'notorio' for masculine things (un cambio notorio) and 'notoria' for feminine things (una diferencia notoria).
Positioning for Emphasis
You usually place 'notorio' after the noun it describes to sound natural, though in very formal writing it might occasionally appear before.
The 'Notorious' Trap
Mistake: “Using 'notorio' to mean someone is famous for doing something bad.”
Correction: In English, 'notorious' is usually negative. In Spanish, 'notorio' is mostly neutral and just means 'obvious' or 'clear.' To say someone is notorious in a bad way, use 'infame'.
Famoso vs. Conocido
Related Translations
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