na-adjective, noun
vulgar; coarse; crude; boorish
Describes speech, behavior, or a person that is low-class, ill-mannered, or lacking refinement. Often used in formal or written contexts.
彼の野卑な言葉遣いに、周囲の人は眉をひそめた。
People around him frowned at his vulgar language.
その政治家の野卑な振る舞いは、多くの有権者の反感を買った。
The politician's boorish behavior offended many voters.
下品 is a more common and general word for 'vulgar' or 'crude', while 野卑 emphasizes a rough, uncultured, or boorish quality, often with a nuance of low social standing.
粗野 focuses on roughness and lack of polish, often in behavior or speech, and is more about being uncouth than specifically low-class.
Compound of 野 (wild, rustic) and 卑 (lowly, base). The combination conveys a sense of uncultured, low-class coarseness.