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

Examples
Mi tío está un poco chiflado, siempre habla con las plantas.
My uncle is a little crazy (eccentric); he always talks to the plants.
Ella está chiflada por el chocolate; come una barra al día.
She is crazy about chocolate; she eats a bar a day.
¿Estás chiflado? ¡No puedes saltar desde ahí!
Are you nuts? You can't jump from there!
Changing Endings
Like most Spanish adjectives, 'chiflado' changes its ending to match the person or thing it describes: 'chiflado' (masculine singular), 'chiflada' (feminine singular), 'chiflados' (masculine plural), and 'chifladas' (feminine plural).
Mixing Ser and Estar
Mistake: “Soy chiflado.”
Correction: Estoy chiflado. We usually use 'estar' (to be temporarily or in a state) with 'chiflado' because it describes a current state of mind or behavior, even if it's a common personality trait.
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