1. 副詞
   懊悔地, 遺憾地
   抱歉地
   依依不捨地
   惋惜地, 哀惜地
   

   同義字詞
   agonizingly,bitterly,dolefully,dolorously,grievously,hard,hardly,inconsolably,lugubriously,mournfully,painfully,plaintively,resentfully,ruefully,sadly,sorely,sorrowfully,unhappily,wailfully,woefully,wretchedly
   

例句

1. No, I tell them regretfully .
2. Then, regretfully , it was over.
3. I smiled regretfully , shook my head.
4. So I regretfully passed on the piggie.
5. But I must regretfully ask more of you.
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