acerbic
adjective formal uk/əˈsɜː.bɪk/ us/əˈsɝː.bɪk/
尖刻的;辛辣的
used to describe something that is spoken or written in a way that is direct, clever, and cruel
The letters show the acerbic wit for which Parker was both admired and feared. 信的字里行间流露着帕克的辛辣谐趣，这一点让人们对他既欣赏又惧怕。