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®

manageableness
     n : capable of being managed or controlled [syn: {manageability}]