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

Examples
Mi hermano es muy observador y nota cada pequeño cambio.
My brother is very observant and notices every small change.
Para ser un buen detective, hay que ser muy observador.
To be a good detective, you have to be very keen-eyed.
Gracias a su espíritu observador, evitó un accidente.
Thanks to his watchful spirit, he avoided an accident.
Making it Feminine
To describe a woman, change the ending to 'observadora'. For a group of women, use 'observadoras'.
Position of the Word
When describing a person's character, it usually comes after the word 'ser' (to be) or after the noun it describes.
Using 'Observante'
Mistake: “Él es muy observante.”
Correction: Él es muy observador. While 'observante' exists, it usually refers to religious practice. To say someone is 'noticing,' use 'observador'.
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