The Collaborative International Dictionary of English v.0.48:

Hesitant \Hes"i*tant\, a. [L. haesitans, p. pr. of haesitare:
   cf. F. h['e]sitant. See Hesitate.]
   1. Not prompt in deciding or acting; hesitating.
      [1913 Webster]

   2. Unready in speech. --Baxter.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hesitant
    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:

101 Moby Thesaurus words for "hesitant":
   afraid, agnostic, ambiguous, ambivalent, averse, backward, bashful,
   boggling, canny, capricious, careful, cautious, chancy, changeable,
   circumspect, deliberate, demurring, dicey, diffident, discreet,
   dithering, doubting, equivocal, erratic, faltering, fickle,
   fluctuating, gingerly, guarded, halting, heedful, hesitating,
   incalculable, indecisive, indefinite, indemonstrable, indisposed,
   irresolute, jibbing, judicious, leaving out nothing, loath,
   mindful, modest, noncommittal, of two minds, on guard,
   overlooking no possibility, pause, pawky, politic, polysemous,
   prudent, qualmish, regardful, reluctant, safe, scrupling,
   scrupulous, shilly-shallying, shrinking, shy, skeptical,
   slow to act, squeamish, stammering, sticking, stickling, straining,
   stuttering, tentative, thorough, timid, touch-and-go,
   unaccountable, unadventurous, uncertain, uncommunicative,
   unconfirmable, unconvinced, undaring, undecided, undivinable,
   uneager, unenterprising, unforeseeable, unpersuaded, unprecipitate,
   unpredictable, unprovable, unresolved, unsettled, unsure,
   unverifiable, unwilling, vacillating, vacillatory, variable,
   wavering, whimsical, wobbly