Unfounded rhymes with:
confounded, confounded, confounded, abounded, astounded, confounded, grounded, hounded, impounded, pounded, rebounded, unbounded
Unfounded sounds like:
unbend, unbound, unbounded, unfunded, unopened, unpainted
confounded, confounded, confounded, abounded, astounded, confounded, grounded, hounded, impounded, pounded, rebounded, unbounded
unbend, unbound, unbounded, unfunded, unopened, unpainted