Opulent
Etymology
From Latin "opulentus" ("wealthy, rich"), formed on "ops" ("wealth, resources, power"), whose plural "opes" meant riches. The idea of abundant means carried straight into English. Today it leans toward wealth that is visibly, even ostentatiously, on display.
adjective · /OP-yuh-lunt/
Displaying great wealth, luxury, and lavish abundance.
What it names
The look of conspicuous, almost excessive richness — velvet, gilt, and chandeliers rather than mere comfort.
Example
The hotel lobby was opulent, all marble floors and crystal fixtures.
Related idea
Lavish stresses generous, unstinting quantity; opulent stresses the overall impression of luxurious wealth on display.