“过于伤感地”可以用英语表达为 "overly sentimentally" 或 "excessively melancholically"。
Overly sentimentally：侧重于表达过度情感化、多愁善感的状态。
Excessively melancholically：更强调过度悲伤、忧郁的情绪。
根据具体语境，选择更贴切的表述即可。例如：
He spoke overly sentimentally about his past.（他过于伤感地谈论自己的过去。）
She reacted excessively melancholically to the news.（她对这个消息反应得过于悲伤。）