清い

1. Origins, structure, and basic meaning

• Structure: 清い, read きよい, is an i-adjective meaning physically clear or morally pure.
• Basic usage: 清い水 describes clear mountain water; 清い心 describes a pure intention toward others.

2. Common pitfalls and similar expressions

• Physical clarity and moral purity
  • Water selects clear, while a person's heart selects pure; both use the nonpast adjective directly before the noun.