けがらわしい
けがらわしい · kegarawashii · JLPT N1 · noun
filthy
🗑️ けがれ (kegare, impurity) + いとわしい (repulsive) = filthy and repulsive
Built from 穢れ (kegare, pollution or impurity) and 厭わしい (iwawashii, loathsome). The root names what is polluted and the ending names the feeling of disgust it causes. The unfair sense is a later extension.