The Collaborative International Dictionary of English v.0.48:

Inhabile \In*hab"ile\, a. [L. inhabilis: cf. F. inhabile. See
   In- not, and Habile, and cf. Unable.]
   [1913 Webster]
   1. Not apt or fit; unfit; not convenient; inappropriate;
      unsuitable; as, inhabile matter. [Obs.]
      [1913 Webster]

   2. Unskilled; unready; awkward; incompetent; unqualified; --
      said of persons. [Obs.] See Unable.
      [1913 Webster]