Ill-bred and Second class

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

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

Second class noun - Not the highest quality in a classification.

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