Unadorned rhymes with:
adorned, adorned, adorned, forewarned, horned, mourned, scorned, warned, adorned, darned, forewarned, harned, horned, larned, mourned, scorned, shoehorned, warned
Unadorned sounds like:
underhanded, undermanned, undermined, underneath, underwent, undetermined, undreamed, untrained, unturned