crackpot
🇺🇸
/ˈkrækpɑːt/
🇬🇧
/ˈkrækpɒt/
having very unusual or unreasonable ideas
His crackpot theories about aliens were met with laughter.
他的关于外星人的古怪理论引起了笑声。
a person with very unusual or unreasonable ideas
The professor dismissed the student as a crackpot.
教授认为那个学生是个怪人。