The DICT Development Group

  dumbstruck
      adj 1: as if struck dumb with astonishment and surprise; "a
             circle of policement stood dumbfounded by her denial of
             having seen the accident"; "the flabbergasted aldermen
             were speechless"; "was thunderstruck by the news of his
             promotion" [syn: dumbfounded, dumfounded,
             flabbergasted, stupefied, thunderstruck,
             dumbstruck, dumbstricken]

  63 Moby Thesaurus words for "dumbstruck":
     agape, aghast, agog, all agog, amazed, anaudic, aphasic, aphonic,
     astonished, astounded, at gaze, awed, awestruck, beguiled,
     bewildered, bewitched, breathless, captivated, confounded, dumb,
     dumbfounded, dumbstricken, enchanted, enraptured, enravished,
     enthralled, entranced, fascinated, flabbergasted, gaping, gauping,
     gazing, hypnotized, in awe, in awe of, inarticulate,
     lost in wonder, marveling, mesmerized, mum, mute, open-eyed,
     openmouthed, overwhelmed, popeyed, puzzled, rapt in wonder,
     speechless, spellbound, staggered, staring, stricken dumb,
     stupefied, surprised, thunderstruck, tongue-tied, tongueless,
     under a charm, voiceless, wide-eyed, wonder-struck, wondering,
     wordless