Astounded rhymes with:
abounded, confounded, grounded, hounded, impounded, pounded, rebounded, unbounded, unfounded, abounded, appended, banded, befriended, bended, blinded, branded, broken-winded, commended, comprehended, confounded, contended, corresponded, disbanded, distended, dumbfounded, evenhanded, expended, fended, grounded, heavyhanded, hounded, impounded, lefthanded, long-winded, masterminded, mended, overfunded, pounded, rebounded, redhanded, refunded, remanded, reoffended, reprimanded, rescinded, responded, righthanded, sanded, seconded, short-winded, single-handed, transcended, trended, unamended, unattended, unbounded, unbranded, underfunded, underhanded, unfounded, unfunded, unintended, winded
Astounded sounds like:
accident, accustomed, actinide, actinidia, actmedia, assistant, astound, auctioned