second-class

1. Of secondary status: second-class issues.
2. Of or relating to travel accommodations ranking next below the highest or first class.
3. Of or relating to a class of U.S. and Canadian mail consisting of newspapers and periodicals.

adjective

Of low or lower quality: common, inferior, low-grade, low-quality, mean², mediocre, second-rate, shabby, substandard. See better/worse.

The adjective has one meaning:

Meaning #1: of inferior status or quality