stuffed shirt
US /stʌft ʃɜrt/
UK /stʌft ʃɜrt/

1.
estirado, pedante
a pompous, formal, and often self-important person
:
•
He's such a stuffed shirt, always talking down to everyone.
Es un estirado, siempre menospreciando a todo el mundo.
•
The new manager is a bit of a stuffed shirt, very rigid and formal.
El nuevo gerente es un poco estirado, muy rígido y formal.