低劣 (dīliè): inferior

Meanings

Zhè zhǒng dīliè de chǎnpǐn bù gāi chūshòu.

This kind of inferior product should not be sold.

Tā de shǒuduàn fēicháng dīliè.

His methods are extremely underhanded.

usage

低劣 is stronger and more negative than 低级. It implies contemptibly poor quality, often used for products, methods, or behavior.

低 dī

劣 liè