鈍い

1. Origins, structure, and basic meaning

• Structure: 鈍い, read にぶい, denotes a state of being unsharp or slow in sensation and response.
• Basic usage: It describes a knife edge that no longer cuts well and a slow response to a question.

2. Common pitfalls and similar expressions

• Opposite of sharpness or quick response
  • For a tool it means unsharp; for a response it means not quick or sensitive.