upstart
🇺🇸
/ˈʌpstɑːrt/
🇬🇧
/ˈʌpstɑːt/
A person who has recently gained a position of importance and acts arrogantly.
The upstart CEO thought he knew everything and didn't listen to the experienced employees.
這位自命不凡的CEO認為自己無所不知,不聽取豐富經驗的員工的意見。