Undelivered rhymes with:
delivered, delivered, delivered, delivered, rivard, shivered, brevard, colvard, covered, delivered, discovered, endeavored, evered, favored, fevered, flavored, harvard, havard, hovered, maneuvered, outmaneuvered, quavered, recovered, rediscovered, rivard, savard, savored, severed, shivered, uncovered, undiscovered, wavered