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You could say:

"Kimi wa baka da" which is if you want to say it casually

"Omae wa baka dayo" which is if you want to say it slightly more rudely

"Kisama/Teme wa baka dayo" which you should only use on your enemies

It is possible to say it politely: "Anata wa baka des", but it would rarely be used.

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13y ago

What else can I help you with?