How to Say "uninterested" in Spanish
The Spanish word for “uninterested” is “aburrido” — A1 level. This is a very common word in everyday Spanish.

Examples
Estoy aburrido porque no hay nada que hacer.
I am bored because there is nothing to do.
Mis hermanos están aburridos de esperar el autobús.
My siblings are bored of waiting for the bus.
Ella estaba aburrida con la conversación.
She was bored with the conversation.
Aburrido with ESTAR (State/Emotion)
When 'aburrido' describes a temporary feeling or state—that someone is feeling bored right now—you must use the verb ESTAR: 'Yo estoy aburrido' (I am bored).
Mixing Ser and Estar
Mistake: “Using SER when you mean 'to feel bored': 'Soy aburrido.'”
Correction: Use ESTAR for feelings: 'Estoy aburrido.' (Saying 'Soy aburrido' means 'I am a boring person.')
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