Acting or speaking in a way that shows excessive pride or self-importance; grandiose and often annoying.
From Latin 'pompa' (procession, display, pomp) via Old French 'pompeux.' The root likely connects to the Greek word for 'pompē' (procession), suggesting something meant to be impressive and showy.
The word 'pomp' comes from the same root, and Roman generals would return from battles with showy 'pomps'—elaborate processions where they'd parade their victories, which is exactly the vain displaying that 'pompous' people still do with their accomplishments.
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