臆断

例句：

1. 1. He made an unsubstantiated assumption that the meeting would be canceled.
   他做出了一个未经证实的假设，认为会议将被取消。
2. 2. The scientist had to rely on his intuition to make a decision.
   科学家不得不依靠直觉来做决定。
3. 3. The company's executives were accused of making baseless accusations against their competitors.
   该公司的高管被指控对他们的竞争对手进行毫无根据的指责。