真诚 (zhēn chéng): อย่างจริงใจ

When he apologized to me, his attitude was very sincere, and I forgave him right away.

Although this small shop isn't big, the owner is sincere with every customer, so business has always been good.

The most important thing in making friends is sincerity; if you always lie, others won't trust you.

She sincerely thanked everyone who had helped her, and everyone was moved.