鬼門

1. Origins, structure, and basic meaning

• Structure: 鬼門(きもん) refers to a traditionally avoided direction or a field that is particularly difficult for someone.
• Basic usage: It names the northeast as traditionally regarded as unlucky or figuratively describes a weak area such as mental arithmetic.

2. Common pitfalls and similar expressions

• Something difficult for a person
  • 彼にとって鬼門 means a subject or challenge that is especially difficult for him.
  • Whereas 苦手 broadly describes being poor at or uncomfortable with something, 鬼門 figuratively names the troublesome target itself.