Ill-bred and Low-class

Ill-bred adjective - Lacking in refinement or good taste.

Low-class and ill-bred are semantically related. In some cases you can use "Low-class" instead an adjective phrase "Ill-bred".

Low-class adjective - Occupying the lowest socioeconomic position in a society.

Ill-bred and low-class are semantically related. Sometimes you can use "Ill-bred" instead an adjective phrase "Low-class".