It means very foolish.
Sample Usage
Edith is as silly as a goose. She thinks that reading aloud to her houseplants will help them grow.
Karthik: The ad in the newspaper said this lotion would make my hair grow faster, but I've been using it for a whole month and my hair is still the same length. Kiran: You're as silly as a goose! Do you believe everything you read in newspaper ads?
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