na-adjective, noun
base; mean; vulgar; despicable; low
Describes a person's character, behavior, or speech as morally low, coarse, or contemptible. Strongly negative.
彼の下劣な態度には本当に腹が立った。
I was really angered by his despicable attitude.
そんな下劣な言葉
You shouldn't use such vulgar language.
Compound of 下 (low, down) and 劣 (inferior, bad). The combination conveys a sense of low and inferior character.