fatuously
🇺🇸
/ˈfætʃuəsli/
🇬🇧
/ˈfætʃuəsli/
in a foolish or silly way
He fatuously believed that he could fly by attaching wings to his arms.
그는 팔에 날개를 붙이면 날 수 있다고 어리석게 믿었다.