1 a : more than is usual, necessary, or proper
He went to extravagant (=elaborate, extreme) lengths to impress his boss.
The brunch featured an extravagant (=lavish) assortment of entrees.
extravagant praise
The company has been making extravagant claims/promises about the drug’s effectiveness.
1 b : very fancy
an extravagant display
The film is notable for its extravagant settings and special effects.
2 a : very expensive and not necessary
an extravagant purchase
We’re going on a less extravagant vacation this year.
2 b : spending a lot of money
On my income, I can’t afford to be extravagant. (=I can’t afford to buy expensive things that I don’t need)
Her extravagant spending has to stop.
— extravagantly adverb
Her work was praised extravagantly.
an extravagantly expensive wedding