Vocabulary What does 良さ (よさ, yosa) mean? 良さ (よさ, yosa) means merit; virtue; good quality. Quick factsReadingよさRomajiyosaPart of speechnoun 良さよさyosamerit; virtue; good quality1noun merit; virtue; good qualityAlso written: 好さ、善さKanji in this word良good, fine; skilled