noun, na-adjective
Refers to a state or quality of being luxurious, extravagant, or indulgent. Used as a noun or na-adjective.
彼は贅沢な生活を送っている。
He leads a life of luxury.
このホテルは贅沢の極みだ
This hotel is the height of luxury.
noun or participle which takes 'suru'
live in luxury; indulge oneself
Verb sense with する, describing the act of living luxuriously or indulging in extravagance.
たまには贅沢して高級レストランに行こう。
Let's indulge ourselves and go to a fancy restaurant for a change.
彼は若い頃に贅沢しすぎて借金を作った。
He lived too extravagantly in his youth and ended up in debt.
na-adjective
lavish; abundant; copious; wasteful
Often used adverbially as 贅沢に to describe using something in a lavish, generous, or wasteful manner.
彼女はバターを贅沢に使ったケーキを焼いた。
She baked a cake using butter lavishly.
時間を贅沢に使って旅行を楽しんだ。
I enjoyed the trip, spending time abundantly.
na-adjective, noun
Used in the phrase 贅沢を言う to mean making excessive or unreasonable demands. Also appears in other contexts implying something is too much to ask for.
See also: 贅沢を言う
給料をもらっているだけでも贅沢を言うな。
Don't make excessive demands; you're lucky just to be getting a salary.
この状況で文句を言うのは贅沢だ。
Complaining in this situation is unreasonable.