\Un*bal"last*ed\, a.
1. [Properly p. p. unballast.] Freed from ballast; having
   discharged ballast.
2. [Pref. un- not + ballasted.] Not furnished with ballast;
   not kept steady by ballast; unsteady; as, unballasted
   vessels; unballasted wits.
         Unballasted by any sufficient weight of plan. --De
                                               Quincey.