Meaning and Usage
The verb 鈍る (にぶる) primarily means "to become dull" or "to become less sharp," and it is often used to describe physical objects like blades or senses such as reaction speed and concentration. It can also refer to a decline in mental or physical abilities.
Common Contexts
鈍る is frequently used when talking about tools (like knives or blades) becoming blunt after use or disuse. It also describes human faculties such as reflexes, concentration, or sensitivity becoming less sharp, especially with aging or lack of practice.
Collocations and Patterns
- 鈍る + 感覚 (かんかく): to have dulled senses
- 反応が鈍る: reactions become slow
- 集中力が鈍る: concentration weakens
- 刃が鈍る: blade becomes dull
These collocations help express physical or mental dullness clearly.
Register and Nuance
鈍る is a neutral verb, suitable for both formal and informal contexts. It often implies a gradual decline rather than a sudden change.
Common Learner Mistake
Learners sometimes confuse 鈍る with 怠る (おこたる), which means "to neglect" or "to be lazy." Remember, 鈍る focuses on becoming dull or less sharp, not on neglecting an action.