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Phrase(s): *silly as a goose
very foolish. (*Also: as ~.) • Edith is as silly as a goose. She thinks that reading aloud to her houseplants 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?
McGrawhill's American Idioms And Phrasal Verbs