epistolical

adj.=epistolary

书信的；用书信体写的；与写信有关的

形容词

1. He maintained an epistolical relationship with his pen pal for over 10 years.
他和笔友保持了超过10年的书信联系。
2. The epistolical format of the novel allows the readers to gain insights into the characters' thoughts and emotions.
这本小说采用书信的形式，让读者能够深入了解角色的思想和情感。