Adjective
[[]][Spending much more money than is necessary or wise.]
He spent an extravagant amount of money on a gold-plated watch.
Adjective
[[]][Going beyond what is reasonable][necessary][or appropriate in scale or degree.]
The company made extravagant claims about the effectiveness of the new drug.
Adjective
[[]][Exceeding the bounds of moderation or restraint in style or behavior.]
The ballroom was decorated in an extravagant style with crystal chandeliers and velvet drapes.