The Collaborative International Dictionary of English v.0.48:

hesitating \hesitating\ adj.
   holding back because of doubt or lack of confidence.

   Syn: hesitant, indecisive.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Hesitate \Hes"i*tate\, v. i. [imp. & p. p. Hesitated; p. pr. &
   vb. n. Hesitating.] [L. haesitatus, p. p. of haesitare,
   intens. fr. haerere to hesitate, stick fast; to hang or hold
   fast. Cf. Aghast, Gaze, Adhere.]
   [1913 Webster]
   1. To stop or pause respecting decision or action; to be in
      suspense or uncertainty as to a determination; as, he
      hesitated whether to accept the offer or not; men often
      hesitate in forming a judgment. --Pope.
      [1913 Webster]

   2. To stammer; to falter in speaking.

   Syn: To doubt; waver; scruple; deliberate; demur; falter;
        stammer.
        [1913 Webster]

WordNet (r) 3.0 (2006):

hesitating
    adj 1: lacking decisiveness of character; unable to act or
           decide quickly or firmly [syn: hesitant, hesitating]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "hesitating":
   agnostic, ambiguous, balbutient, bashful, boggling, capricious,
   cautious, chancy, changeable, demurring, dicey, diffident,
   doubting, equivocal, erratic, faltering, fickle, halting, hesitant,
   incalculable, indecisive, indemonstrable, irresolute, jibbing,
   modest, polysemous, qualmish, scrupling, scrupulous,
   shilly-shallying, shrinking, shy, skeptical, squeamish, stammering,
   sticking, stickling, straining, stumbling, stuttering, tentative,
   timid, touch-and-go, unaccountable, uncertain, unconfirmable,
   unconvinced, undivinable, unforeseeable, unpersuaded,
   unpredictable, unprovable, unsure, unverifiable, variable,
   wavering, whimsical