stuffed-shirt

listen to the pronunciation of stuffed-shirt
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Alternative spelling of stuffed shirt
One who is pompous or self-important, especially one who is officious in a position of authority

Dr. Laughlin was the only one in a movie party who detested the second male lead—I regarded him as overserious, pedantic, a stuffed shirt..

Used attributively

The opportunistic style that was the bank's trademark still prevails and continues to attract talented young Hong Kongers looking for an alternative to the stuffed-shirt culture of most U.S. and European banks.

(Slang) pompous and conceited person
a bore
disapproval If you describe someone, especially someone with an important position, as a stuffed shirt, you mean that they are extremely formal and old-fashioned. In a pinstriped suit he instantly looked like a stuffed shirt. A person regarded as pompous or stiff. someone who behaves in a very formal way and thinks that they are important