The Collaborative International Dictionary of English v.0.48:

Wonder \Won"der\, v. i. [imp. & p. p. Wondered; p. pr. & vb.
   n. Wondering.] [AS. wundrian.]
   [1913 Webster]
   1. To be affected with surprise or admiration; to be struck
      with astonishment; to be amazed; to marvel.
      [1913 Webster]

            I could not sufficiently wonder at the intrepidity
            of these diminutive mortals.          --Swift.
      [1913 Webster]

            We cease to wonder at what we understand. --Johnson.
      [1913 Webster]

   2. To feel doubt and curiosity; to wait with uncertain
      expectation; to query in the mind; as, he wondered why
      they came.
      [1913 Webster]

            I wonder, in my soul,
            What you would ask me, that I should deny. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wondering
    adj 1: showing curiosity; "if someone saw a man climbing a light
           post they might get inquisitive"; "raised a speculative
           eyebrow" [syn: inquisitive, speculative,
           questioning, wondering(a)]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "wondering":
   agape, aghast, agog, all agog, amazed, astonished, astounded,
   at gaze, awed, awestruck, beguiled, bewildered, bewitched,
   breathless, captivated, confounded, dumbfounded, dumbstruck,
   enchanted, enraptured, enravished, enthralled, entranced,
   fascinated, flabbergasted, gaping, gauping, gazing, hypnotized,
   in awe, in awe of, lost in wonder, marveling, mesmerized,
   open-eyed, openmouthed, overwhelmed, popeyed, puzzled,
   rapt in wonder, spellbound, staggered, staring, stupefied,
   surprised, thunderstruck, under a charm, wide-eyed,
   wonder-struck