Disheartening rhymes with:
heartening, heartening, smartening, heartening, shortening, smartening, battening, brightening, captaining, enlightening, fattening, flattening, frightening, heartening, heightening, lightening, shortening, smartening, straightening, sweetening, threatening, tightening
Disheartening sounds like:
decorating, decorations, degradations, degrading, desecrations, deserting, desertions, desjardins, discarding, discrediting, discretions