When delivering difficult news, it's important to show sensitivity and tact. The phrase "I/we regret to inform/tell you that" is one way to do this, but it's not the only way. There are several synonyms for this phrase that can convey the same message while using different words. Some options are "unfortunately," "sadly," "regrettably," "with sorrow," or "it pains me to say." These phrases express empathy and understanding for the recipient's situation, while delivering the news in a respectful way. Ultimately, it's important to choose a phrase that feels authentic to your voice while still showing care and compassion towards the recipient.