Of low quality or low class; vulgar, cheap, or inferior in taste or workmanship.
彼のジョークはいつも低級で、あまり笑えない。
His jokes are always low-class and not very funny.
低級な言葉遣いは会社の印象を悪くする。
Vulgar language damages the company's image.
その映画は作りが粗く、内容も低級だと批評された。
The film was criticized as poorly made and of low quality.