ASTOUNDED
amazed, astonied, astonished, astounded, stunned
(adjective) filled with the emotional impact of overwhelming surprise or shock; “an amazed audience gave the magician a standing ovation”; “I stood enthralled, astonished by the vastness and majesty of the cathedral”; “astounded viewers wept at the pictures from the Oklahoma City bombing”; “stood in stunned silence”; “stunned scientists found not one but at least three viruses”
Source: WordNet® 3.1
Verb
astounded
simple past tense and past participle of astound
Adjective
astounded (comparative more astounded, superlative most astounded)
Surprised, amazed, astonished or bewildered.
Source: Wiktionary
ASTOUND
As*tound", a. Etym: [OE. astouned, astound, astoned, p. p. of astone.
See Astone.]
Definition: Stunned; astounded; astonished. [Archaic] Spenser.
Thus Ellen, dizzy and astound. As sudden ruin yawned around. Sir W.
Scott.
As*tound", v. t. [imp. & p. p. Astounded, [Obs.] Astound; p. pr. &
vb. n. Astounding.] Etym: [See Astound, a.]
1. To stun; to stupefy.
No puissant stroke his senses once astound. Fairfax.
2. To astonish; to strike with amazement; to confound with wonder,
surprise, or fear.
These thoughts may startle well, but not astound The virtuous mind.
Milton.
Source: Webster’s Unabridged Dictionary 1913 Edition