If you say that someone died peacefully, you mean that they suffered no pain or violence when they died.
例句
He died peacefully on 10th December after a short illness.病了一小段时间之后,他于12月10日安详辞世。
英汉词典释义
adv.
平静地;和平地
He lives straight and peacefully with his neighbours.他和他的邻居坦诚而和睦地住在一起。Atheists and theists live together peacefully and amiably in this country.无神论者和有神论者在该国和睦相处。
英英词典释义
Adverb
1. in a peaceful manner;
"the hen settled herself on the nest most peacefully"