Passable1. (a.) Capable of being passed, traveled, navigated, traversed, penetrated, or the like; as, the roads are not passable; the stream is passable in boats.
2. (a.) Capable of being freely circulated or disseminated; acceptable; generally receivable; current.
3. (a.) Such as may be allowed to pass without serious objection; tolerable; admissible; moderate; mediocre.
Thesaurus Entries
OK, acceptable, accessible, adequate, admissible, agreeable, all right, allowable, alright, attainable, average, better than nothing, betwixt and between, decent, dull, fair, fair to middling, fairish, good enough, goodish, indifferent, insipid, lackluster, mediocre, medium, middling, moderate, modest, namby-pamby, navigable, negotiable, not amiss, not bad, not half bad, not so bad, of a kind, of a sort, of sorts, okay, open, presentable, pretty good, reachable, respectable, satisfactory, so so, so-so, sufficient, tedious, tenable, tidy, tolerable, traversable, unblocked, unexceptionable, unexceptional, unobjectionable, unobstructed, vapid, viable, wishy-washy, workmanlike