Unadorn rhymes with:
adorn, adorn, doorn, dorn, vandorn, aborn, adorn, alcorn, allcorn, amborn, bjoern, bjorn, born, borne, bourn, bourne, corn, corne, doorn, dorn, firstborn, forewarn, forlorn, forsworn, horn, horne, korn, lamborn, lorne, lowborn, morn, mourn, orn, orne, porn, radborne, reborn, schorn, scorn, shorn, sporn, steinborn, stillborn, sworn, thorn, thorne, torn, unborn, vandorn, vanhorn, vanhorne, warn, warne, wellborn, worn, zorn
Unadorn sounds like:
underarm, underman, undermine, unitarian, unitrin, unterman