Undreamed rhymes with:
dreamed, creamed, dreamed, screamed, streamed, beamed, creamed, deemed, dreamed, esteemed, gleamed, redeemed, schemed, screamed, seemed, steamed, streamed, teamed, themed, unredeemed
Undreamed sounds like:
unadorned, underhanded, undermanned, undermined, underneath, underwent, undetermined, untrained, unturned