IPA: /fəˈtjuːɪti/
KK: /fəˈtjuːɪti/
A state of being foolish or lacking in intelligence; a foolish act or idea.
His fatuity in believing he could win without practice was surprising.
Fatuity → It is formed from "fatuus" (meaning foolish or silly) and the suffix "-ity" (meaning the state or quality of). The word "fatuity" refers to the state of being foolish or lacking in intelligence.
Think of 'foolishness' ('fatuus') to remember that 'fatuity' means the quality of being foolish.