Unhappiness rhymes with:
creepiness, cabiness, caviness, cleanliness, cloudiness, creepiness, friendliness, frothiness, solitariness, steadiness, stinginess, storminess, wariness, worthiness
creepiness, cabiness, caviness, cleanliness, cloudiness, creepiness, friendliness, frothiness, solitariness, steadiness, stinginess, storminess, wariness, worthiness