A katakana な-adjective for something noble in character, appearance, or atmosphere; in everyday use it often praises a refined or dignified impression rather than literal aristocratic rank.
Her bearing is very noble and refined.
There is a noble, dignified air in the way she stands.
This perfume gives a refined impression.
This shop has a refined, noble atmosphere.
He has noble, refined features.
下品 describes something vulgar or crude, the direct opposite of the refined, dignified impression conveyed by ノーブル.
nobleman
Written in katakana as a foreign-style adjective. No language of origin is specified, so the exact borrowing history is not stated here.