同义词： ruefully remorsefully
以上来源于: WordNet
regretfully
词根： contrite
contrite 悔悟了的；后悔的；悔罪的
contrition 痛悔；悔悟
"It's a lesson not to write letters, " Woolf now continued contritely.
BBC: A Point of View: Mourning the loss of the written word
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