upstarted

/ʌpˈstɑrtɪd/
adjective
  1. Having recently risen to a position of power, wealth, or importance, often in a way that is seen as sudden or undeserved.
    • She felt like an upstarted member of the royal family, unsure of the ancient traditions.
    • The upstarted manager tried to change all the office rules on his first day.
    • The upstarted tech company quickly challenged the industry giants.
Antonyms