The adjective lavish means spending excessively or something that is given in a very large amount or in abundance. It can also act as a verb which means to spend, praise or give in great amount.
Synonyms are excessive, extreme, fancy, or immoderate.
The word origins from Middle French (mid 15th century) lavasse meaning “torrent of rain, deluge”, Old French lavache, deriving out of laver and Latin lavare meaning “to wash”. Its first known use as an adjective is in the 15th century and as a verb in 1542.
Her gown was luxurious and lavish.
He lived in a lavish lifestyle thanks to his billionaire father.
I like his lavish approach to style.