Synonyms and related words :
average, betwixt and between, dull, fair, fair to middling, fairish, fairishly, fairly, indifferent, indifferently, insipid, lackluster, mediocre, mediocrely, medium, middling, middling well, middlingly, moderate, moderately, modest, modestly, namby-pamby, of a kind, of a sort, of sorts, passable, passably, rather, respectable, run-of-mine, run-of-the-mill, tedious, tolerable, tolerably, vapid, wishy-washy