The Collaborative International Dictionary of English v.0.48:

Excursive \Ex*cur"sive\, a.
   Prone to make excursions; wandering; roving; exploring; as,
   an excursive fancy.
   [1913 Webster]

         The course of excursive . . . understandings. --I.
                                                  Taylor.
   -- Ex*cur"sive*ly, adv. -- Ex*cur"sive*ness,, n.
   [1913 Webster]