na-adjective
aristocratic; noble; patrician
Describes a person, manner, lifestyle, or atmosphere that is refined, elegant, and characteristic of the aristocracy.
彼女は貴族的な雰囲気を持っている。
She has an aristocratic air about her.
そのホテルは貴族的な装飾で知られている。
The hotel is known for its aristocratic decor.
上品 means 'elegant' or 'refined' in a general sense, whereas 貴族的 specifically evokes the elegance associated with the aristocracy.
Formed from 貴族 (nobility, aristocrat) + 的 (-like, -ic), a common pattern for creating adjectival nouns.