regret
This term conveys a heavy emotional burden, blending sadness with the realization that a past action cannot be undone. It differs from simple sadness by requiring a specific cause—usually a personal choice or a missed opportunity—creating a sense of internal conflict or longing for a different outcome. In formal correspondence, the word functions as a polite social lubricant to soften the impact of negative news. When used in the phrase "we regret to inform you," it serves as a professional courtesy rather than an expression of genuine emotional distress or repentance.
Meanings
A feeling of sadness, repentance, or disappointment over something that has happened or been done.
"He felt a deep sense of regret for the words he had spoken in anger."
To feel sad, repentant, or disappointed over something that one has done or failed to do.
"She deeply regrets leaving her hometown so many years ago."
To be sorry to inform someone about something, typically used in formal communication to deliver bad news.
"We regret to inform you that your application has been unsuccessful."