The Collaborative International Dictionary of English v.0.48:

ambivalent \ambivalent\ adj.
   1. 1 undecided as to whether or not to take a proposed course
      of action; having feelings both for and against the
      proposed action.

   Syn: on the fence(predicate), suspensive, uncertain
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

ambivalent
    adj 1: uncertain or unable to decide about what course to
           follow; "was ambivalent about having children"