无说服力的

例句：

1. 1. The presentation was completely unpersuasive, leaving the audience confused.
   这次的演讲完全无法说服听众，让人困惑不解。
2. 2. The argument was unpersuasive, failing to convince anyone of its validity.
   这个论点缺乏说服力，无法说服任何人认为其有效。
3. 3.The book's arguments were unpersuasive, lacking in logic and persuasiveness.
   这本书的论点缺乏说服力，逻辑和说服力不足。