前よりも(まえよりも)あからさまに笑う(わらう)ようになり、「他人の(たにんの)解決(かいけつ)した不幸を(ふこうを)笑いたがる(わらいたがる)」利己心

Naigu was overjoyed, thinking 'Now nobody will laugh at me.' However, from the next day, the priests at the temple and the townspeople began to giggle and laugh at him even more openly than before. Humans sympathize with others' misfortunes, but once those are resolved, they feel dissatisfied and want to make them a laughingstock again—possessing a selfish heart (the egoism of bystanders).