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From The Collaborative International Dictionary of English v.0.48:
Unballasted \Un*bal"last*ed\, a. 1. [Properly p. p. of unballast.] Freed from ballast; having discharged ballast. [1913 Webster] 2. [Pref. un- not + ballasted.] Not furnished with ballast; not kept steady by ballast; unsteady; as, unballasted vessels; unballasted wits. [1913 Webster] Unballasted by any sufficient weight of plan. --De Quincey. [1913 Webster]