If you are regretful, you show that you regret something. 遗憾的; 后悔的
adjective [原级] 后悔的，遗憾的
Mr. Griffin gave a regretful smile. 格里芬先生遗憾地笑了笑。
Mr. Griffin gave a regretful smile. 格里芬先生遗憾地笑了笑。
