The Collaborative International Dictionary of English v.0.48:

Dubitate \Du"bi*tate\, v. i. [L. dubitatus, p. p. of dubitare.
   See Doubt.]
   To doubt. [R.]
   [1913 Webster]

         If he . . . were to loiter dubitating, and not come.
                                                  --Carlyle.
   [1913 Webster]