英 [rɪˈɡretfl] 美 [rɪˈɡretfl]
adj. 后悔的，遗憾的
regretful /rɪˈɡrɛtfʊl/
形容词 If you are regretful, you show that you regret something. 遗憾的; 后悔的
Mr. Griffin gave a regretful smile.
格里芬先生遗憾地笑了笑。
副词
He shook his head regretfully.
他遗憾地摇了摇头。
regret形容词性regretful（遗憾的） 是regretful,不需要双写t，双写一般出现在动词变化。同样，名词变复数时，也无双写。
... regret v./n.遗憾,懊悔,抱歉 regretful a.后悔的；懊悔的 regrettable 可后悔的；可惜的 ...
... regretful 后悔的，遗憾的；惋惜的 regrettable 令人遗憾的；可惜的；可悲的；抱歉的 regrettably 遗憾地；抱歉地；可悲地 ...
... regretful 后悔的，遗憾的；惋惜的 regrettable 令人遗憾的；可惜的；可悲的；抱歉的 regrettably 遗憾地；抱歉地；可悲地 ...
regrettable 令人遗憾的；可惜的；可悲的；抱歉的
regrettably 遗憾地；抱歉地；可悲地
regretfully 懊悔地，遗憾地；抱歉地
regret 遗憾；抱歉；悲叹
regret 感到后悔；感到抱歉
regret 后悔；惋惜；哀悼
Mr. Griffin gave a regretful smile.
格里芬先生遗憾地笑了笑。
He feels regretful.
他感到遗憾。
One can imagine how regretful he was.
可以想像他是多么懊悔。
The long indictment against Ravi can be seen as a kind of regretful commentary about the absence of such statutes.
But in the final analysis what makes us happy or regretful is not only money but if our lives have found purpose.
The justices at times appeared almost regretful they took the case, while at other points they split neatly into well-worn ideological camps.