adv.遗憾地，痛惜地，失望地，懊悔地，遗憾的是，十分遗憾

I regretfully inform you that your application has been rejected.
我遗憾地通知你，你的申请已被拒绝。
It was with deep regret that I had to cancel my vacation plans.
我不得不取消假期计划，对此深感遗憾。
She looked at the empty bottle, regretfully realizing she'd drunk too much.
她看着空瓶子，后悔自己喝得太多了。
He quit his job regretfully due to health issues.
由于健康问题，他遗憾地辞去了工作。
We regretfully declined the invitation to the wedding because of a prior commitment.
由于已有先前的约定，我们遗憾地拒绝了婚礼邀请。
The decision to sell the family home was made with many regretful emotions.
决定出售祖传的房子充满了诸多遗憾的情绪。
She regretfully turned down the opportunity to study abroad.
她遗憾地放弃了出国留学的机会。
With a heavy heart, he said goodbye to his old friends, regretting the time they wouldn't spend together.
他怀着沉重的心情向老朋友们告别，后悔他们无法共度的时光。
He regretfully acknowledged his mistake and apologized to those affected.
他遗憾地承认了自己的错误，并向受到影响的人道歉。
She watched the sunset, regretfully remembering the missed opportunities in her life.
她看着日落，遗憾地回忆起生活中错过的那些机会。