礼節

1. Origins, structure, and basic meaning

• Structure: 礼節(れいせつ) means courtesy and proper conduct toward other people.
• Basic usage: It is used for one's conduct toward elders or people with differing positions.

2. Common pitfalls and similar expressions

• The negative in 欠かなかった
  • 礼節を欠かなかった means that someone maintained courtesy. It negates 欠く(かく), which expresses lacking something.