[syn: astonishing, astounding, staggering, stupefying]
The Collaborative International Dictionary of English v.0.48:
Astound \As*tound"\, v. t. [imp. & p. p. Astounded, [Obs.]
   Astound; p. pr. & vb. n. Astounding.] [See Astound, a.]
   1. To stun; to stupefy.
      [1913 Webster]
            No puissant stroke his senses once astound.
                                                  --Fairfax.
      [1913 Webster]
   2. To astonish; to strike with amazement; to confound with
      wonder, surprise, or fear.
      [1913 Webster]
            These thoughts may startle well, but not astound
            The virtuous mind.                    --Milton.
      [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Astounding \As*tound"ing\, a.
   Of a nature to astound; astonishing; amazing; as, an
   astounding force, statement, or fact. -- As*tound"ing*ly,
   adv.
   [1913 Webster]
WordNet (r) 3.0 (2006):
astounding
    adj 1: bewildering or striking dumb with wonder [syn:
           astounding, dumbfounding, dumfounding]
    2: so surprisingly impressive as to stun or overwhelm; "such an
       enormous response was astonishing"; "an astounding
       achievement"; "the amount of money required was staggering";
       "suffered a staggering defeat"; "the figure inside the boucle
       dress was stupefying" [syn: astonishing, astounding,
       staggering, stupefying]
Moby Thesaurus II by Grady Ward, 1.0:
45 Moby Thesaurus words for "astounding":
   amazing, appalling, astonishing, awe-inspiring, awesome, awful,
   breathtaking, confounding, dire, direful, dread, dreaded, fell,
   formidable, ghastly, ghoulish, grim, grisly, gruesome, hideous,
   horrendous, horrible, horrid, horrific, horrifying, macabre,
   mind-boggling, miraculous, morbid, overwhelming, prodigious,
   redoubtable, schrecklich, shocking, spectacular, staggering,
   startling, stunning, stupendous, surprising, terrible, terrific,
   tremendous, wonderful, wondrous