jumped-up
adjective [ before noun ] UK informal disapproving uk/ˌdʒʌmptˈʌp/ us/ˌdʒʌmptˈʌp/
（尤指因地位显着提高后）自命不凡的，妄自尊大的
behaving as if you are very important in your job or position, especially because you used to be in a much lower position
He's just a jumped-up office boy (= he was once only an office boy) . 他不过是从办公室勤杂员的位子上升上来的妄自尊大的家伙。