- 1. 懊悔的；遺憾的；惆悵的[（+for/about）][+that]
I am regretful for hurting her feelings. 我後悔傷害了她的感情。
We are regretful to inform you that ....官式文章，「感到遺憾」 -or- We feel deeply regretful that ...「深表遺憾」
We are regretful and sad to receive the news of the withdrawal from your company. We have...
"Grasp at time, or if you'll be regretful." or "You will regret if you don't grasp at time." * grasp at 是片語...quot;這個動作的後面,那麼把握時間都用現在式,"將會"後悔當然要用will be regretful囉!