Pronunciation: /fuːl ˈnoʊʃən/
noun an idea or belief that is foolish or lacking in good sense
A1 The idea of flying without wings is a fool notion.
A2 She believed that drinking vinegar would cure all illnesses, which was a fool notion.
B1 Thinking that you can become a millionaire overnight is a fool notion.
B2 His fool notion of starting a business without any prior experience led to failure.
C1 The politician's fool notion of solving poverty with one simple policy was unrealistic.
C2 She dismissed his fool notion of time travel as pure fantasy.
formal The idea that money can buy happiness is a fool notion that has been debunked by numerous studies.
informal Thinking that skipping class won't affect your grades is a fool notion, trust me.
slang Believing that you can eat junk food all day and still stay healthy is a fool notion, dude.
figurative The belief that you can achieve success without hard work is a fool notion that will only lead to disappointment.
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is having a fool notion
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a fool notion