silly as a goose

*silly as a goose

very foolish. (*Also: as ~.) Edith is as silly as a goose. She thinks that reading aloud to her house-plants will help them grow. The ad in the newspaper said this lotion would make my hair grow back, but I've been using it for a whole month and my hair is still the same. Jane: You're as silly as a goose! Do you believe everything you read in newspaper ads?
See also: goose, silly