Learner's definition of EXTRAVAGANT
[more extravagant; most extravagant]
1 a : more than is usual, necessary, or proper
b : very fancy
He went to extravagant [=elaborate, extreme] lengths to impress his boss.
The brunch featured an extravagant [=lavish] assortment of entrees.
The company has been making extravagant claims/promises about the drug's effectiveness.
2 a : very expensive and not necessary 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.