The Collaborative International Dictionary of English v.0.48:

Surprise \Sur*prise"\, v. t. [imp. & p. p. Surprised; p. pr. &
   vb. n. Surprising.] [From Surprise, n.: cf. F.
   surprendre, p. p. surpris.]
   1. To come or fall suddenly and unexpectedly; to take
      unawares; to seize or capture by unexpected attack.
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            Fearfulness hath surprised the hypocrites. --Isa.
                                                  xxxiii. 14.
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            The castle of Macduff I will surprise. --Shak.
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            Who can speak
            The mingled passions that surprised his heart?
                                                  --Thomson.
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   2. To strike with wonder, astonishment, or confusion, by
      something sudden, unexpected, or remarkable; to confound;
      as, his conduct surprised me.
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            I am surprised with an uncouth fear.  --Shak.
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            Up he starts,
            Discovered and surprised.             --Milton.
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   3. To lead (one) to do suddenly and without forethought; to
      bring (one) into some unexpected state; -- with into; as,
      to be surprised into an indiscretion; to be surprised into
      generosity.
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   4. To hold possession of; to hold. [Obs.]
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            Not with me,
            That in my hands surprise the sovereignity. --J.
                                                  Webster.
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   Syn: See Astonish.
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The Collaborative International Dictionary of English v.0.48:

Surprising \Sur*pris"ing\, a.
   Exciting surprise; extraordinary; of a nature to excite
   wonder and astonishment; as, surprising bravery; a surprising
   escape from danger. -- Sur*pris"ing*ly, adv. --
   Sur*pris"ing*ness, n.
   [1913 Webster]

   Syn: Wonderful; extraordinary; unexpected; astonishing;
        striking.
        [1913 Webster] Surquedous

WordNet (r) 3.0 (2006):

surprising
    adj 1: causing surprise or wonder or amazement; "the report
           shows a surprising lack of hard factual data"; "leaped up
           with surprising agility"; "she earned a surprising amount
           of money" [ant: unsurprising]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "surprising":
   abrupt, amazing, astonishing, astounding, breathtaking,
   confounding, electrifying, eye-opening, hasty, headlong, impetuous,
   impulsive, jarring, jolting, mind-boggling, miraculous,
   nerve-shattering, overwhelming, precipitant, precipitate,
   precipitous, prodigious, quick, shocking, spectacular, speedy,
   staggering, startling, stunning, stupendous, sudden, swift,
   unanticipated, unexpected, unforeseen, unlooked-for, unpredicted,
   wondrous