crackpot
🇺🇸
/ˈkrækpɑːt/
🇬🇧
/ˈkrækpɒt/
having very unusual or unreasonable ideas
His crackpot theories about aliens were met with laughter.
他的關於外星人的古怪理論引起了笑聲。
a person with very unusual or unreasonable ideas
The professor dismissed the student as a crackpot.
教授認為那個學生是個怪人。