親切

1. Origins, structure, and basic meaning

• Structure: 親切 (しんせつ) functions as an adjectival noun or noun for considerate kindness and helpfulness.
• Basic usage: It can evaluate a person with 親切でした or name a helpful act in 店員の親切.

2. Common pitfalls and similar expressions

• A kind person and kindness itself
  • It may concern character or a specific helpful act, so context distinguishes it from mere politeness.