Today’s adjective is “extravagant”, and it is used to talk about a person who often spends a lot of money. It can also be used to talk about a particular purchase in which someone spends more money than is necessary. For example:
My sister is such an extravagant person. She always spends a lot of money to get things of the best quality.
The most extravagant thing I’ve ever bought was a designer handbag! It cost a lot, but I love it!
Generally I’m not an extravagant person, but I do like to go out to nice restaurants for a steak dinner sometimes.
I can’t believe you bought me a diamond necklace! It’s too extravagant! You shouldn’t have spent so much money!
This adjective is neutral in tone, but if we say “too extravagant”, as in the last example, it becomes negative.