不貞

1. Origins, structure, and basic meaning

• Structure: Written 不貞 and read ふてい, it is a formal term for sexual unfaithfulness within marriage.
• Basic usage: It appears in suspicion directed at a husband in a story and in a compensation claim based on adultery.

2. Common pitfalls and similar expressions

• Marital infidelity rather than wrongdoing generally
  • The word specifically concerns breach of fidelity between spouses.