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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WordNet (r) 3.0 (2006):

surprised
    adj 1: taken unawares or suddenly and feeling wonder or
           astonishment; "surprised by her student's ingenuity";
           "surprised that he remembered my name"; "a surprised
           expression" [ant: not surprised, unsurprised]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "surprised":
   ad-lib, agape, aghast, agog, all agog, amazed, astonished,
   astounded, at gaze, awed, awestruck, beguiled, bewildered,
   bewitched, breathless, captivated, caught napping,
   caught off balance, caught short, confounded, dumbfounded,
   dumbstruck, enchanted, enraptured, enravished, enthralled,
   entranced, extemporaneous, extemporized, fascinated, flabbergasted,
   gaping, gauping, gazing, haphazard, hasty, hypnotized, impromptu,
   improvised, in awe, in awe of, lost in wonder, makeshift,
   marveling, mesmerized, open-eyed, openmouthed, overwhelmed,
   popeyed, precipitate, puzzled, rapt in wonder, rough-and-ready,
   snap, spellbound, staggered, staring, struck with surprise,
   stupefied, taken aback, taken by surprise, taken unawares,
   thunderstruck, tripped up, unarranged, unbegun, unconcocted,
   uncontrived, undeliberated, under a charm, undevised, unhatched,
   unmade, unmanufactured, unorganized, unprepared, unprimed, unready,
   unstudied, wide-eyed, wonder-struck, wondering