单词：regretful 

形容词

• 
  [1.a.regretful] (同义词:[regretful( adj. 后悔的, 抱歉的, 惋惜的, 遗憾的 )]  [sorry( adj. 遗憾的, 对不起的, 可怜的, 抱歉的 )]  [bad( adj. 劣质的, 有害的, 坏的, 不利的, 不健康的, 严重的 )]  )
• 
  注释列句：feeling or expressing regret or sorrow or a sense of loss over something done or undone; "felt regretful over his vanished youth"; "regretful over mistakes she had made"; "he felt bad about breaking the vase"
• 另 外 -> [penitent( adj. 悔过的 n. 悔罪者 )] 
  反义词 -> [unregretful]