Words That Rhyme With "Lightheartedness" :

3 syllables:

heartedness

4 syllables:

desertedness, downheartedness, faintheartedness, halfheartedness, hardheartedness, kindheartedness, trueheartedness, warmheartedness, wholeheartedness

5 syllables:

brokenheartedness, disconcertedness, tenderheartedness