Moderately good or agreeable; not contemptible; not very excellent or pleasing, but such as can be borne or received without disgust, resentment, or opposition; passable; as, a tolerable administration; a tolerable entertainment; a tolerable translation
If you describe something as tolerable, you mean that it is fairly good and reasonably satisfactory, but not of the highest quality or standard. He fell asleep just past midnight with tolerable ease = reasonable + tolerably tol·er·ably He can see tolerably well and he can read
If you describe something as tolerable, you mean that you can bear it, even though it is unpleasant or painful. He described their living conditions as tolerable. intolerable + tolerably tol·er·ably Their captors treated them tolerably well. tolerably hot water
neither good nor bad; "an indifferent performance"; "a gifted painter but an indifferent actor"; "her work at the office is passable"; "a so-so golfer"; "feeling only so-so"; "prepared a tolerable dinner"; "a tolerable working knowledge of French"