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There's probably no exact translation but смешной can work, I think. If a woman tells a man "You're funny" after he does something weird, it's almost equivalent to "You're silly." I think "смешной"...

Interesting. I didn't know this. I don't see the way how to say it in russian without an insult. Technically "вы глупы"/"вы дурак" is a polite form of "ты глуп"/"ты дурак" but you can get a hook or...