Coarseness
Noun and な adjective
れつあく
劣悪な職場環境の会社は、日本ではしばしば「ブラック企業」と呼ばれます。
Companies with very rough work environments are often called "black companies" in Japan.
Inferiority is bad. It is inferiority, after all.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.