discursive          
adjective uk/dɪˈskɜː.sɪv/ us/dɪˈskɝː.sɪv/
 推论的,论证的
involving discussion
  a discursive essay 一篇推论性文章 
  formal东拉西扯的,不着边际的 
talking about or dealing with subjects that are only slightly connected with the main subject for longer than necessary
  a discursive writer/speech 东拉西扯的作家/演讲