物忘れ

1. Origins, structure, and basic meaning

• Structure: 物忘れ (ものわすれ) is a compound noun for momentarily forgetting an object, appointment, or other known matter.
• Basic usage: 物忘れが増える describes episodes becoming more frequent, while 単なる物忘れだった classifies a forgotten key location as an ordinary lapse.

2. Common pitfalls and similar expressions

• Increasing frequency and isolated lapse
  • 物忘れが増える changes episode frequency, whereas 単なる物忘れ classifies one event as minor. The expression alone does not diagnose a medical condition.