Menial and Second-class

Menial adjective - Showing, expressing, or offered in a spirit of humility or unseemly submissiveness.

Second-class and menial are semantically related. In some cases you can use "Second-class" instead an adjective "Menial".

Second-class adjective - Of little or less value or merit.

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