Source : Webster's Revised Unabridged Dictionary (1913)

Tolerable \Tol"er*a*ble\, a. [L. tolerabilis: cf. F.
   tol['e]rable. See {Tolerate}.]
   1. Capable of being borne or endured; supportable, either
      physically or mentally.

            As may affect the earth with cold and heat Scarce
            tolerable.                            --Milton.

   2. 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. --Dryden. --
      {Tol"er*a*ble*ness}, n. -- {Tol"er*a*bly}, adv.

Source : WordNet®

tolerably
     adv 1: in a tolerable manner; "she did it well enough" [syn: {well
            enough}, {to a tolerable degree}, {to an adequate
            degree}]
     2: in an acceptable (but not outstanding) manner; "she plays
        tennis tolerably" [syn: {acceptably}, {so-so}] [ant: {unacceptably},
         {unacceptably}]