鋭い

1. Origins, structure, and basic meaning

• Structure: 鋭い, read するどい, is an i-adjective describing a sharp edge or keen judgment and questioning.
• Basic usage: In 記者から問題の核心を突く鋭い質問が出た。, the reporter's question goes straight to the heart of the issue.

2. Common pitfalls and similar expressions

• Physical sharpness and insight
  • 刃が鋭い describes the blade's physical edge, while 鋭い質問 evaluates a question that penetrates to the core. In the latter use, sharpness conveys insight.