mediocre, poor, second-rate - moderate to inferior in quality; "they improved the quality from mediocre to above average"; "he would make a poor spy" Antonym:superior (indirect, via inferior)
average, fair, mediocre, middling - of no exceptional quality or ability; "a novel of average merit"; "only a fair performance of the sonata"; "in fair health"; "the caliber of the students has gone from mediocre to above average"; "the performance was middling at best" Antonym:extraordinary (indirect, via ordinary)