inferior — lower in station, rank, degree, or grade (often followed by to): a rank inferior to colonel.
cheap — Goods or services that are cheap cost less money than usual or than you expected.
second-rate — of lesser or minor quality, importance, or the like: a second-rate poet.
mediocre — of only ordinary or moderate quality; neither good nor bad; barely adequate: The car gets only mediocre mileage, but it's fun to drive. Synonyms: undistinguished, commonplace, pedestrian, everyday; run-of-the-mill. Antonyms: extraordinary, superior, uncommon, incomparable.
shoddy — of poor quality or inferior workmanship: a shoddy bookcase.
