Source : Webster's Revised Unabridged Dictionary (1913)

Manageable \Man"age*a*ble\, a.
   Such as can be managed or used; suffering control;
   governable; tractable; subservient; as, a manageable horse.

   Syn: Governable; tractable; controllable; docile. --
        {Man"age*a*ble*ness}, n. -- {Man"age*a*bly}, adv.

Source : WordNet®

manageably
     adv : so as to be manageable; "this house is manageably small"
           [ant: {unmanageably}]