鈍にぶる

also: なまる

に

ぶ

る

Common wordJLPTN1Freq.FrequencyTop 50,000

鈍る · godan verb (-ru)

Form	Positive	Negative
Dictionary	鈍にぶる	鈍にぶらない
Polite	鈍にぶります	鈍にぶりません
Past polite	鈍にぶりました	鈍にぶりませんでした
Past	鈍にぶった	鈍にぶらなかった
Te-form	鈍にぶって	鈍にぶらないで
Desire	鈍にぶりたい	鈍にぶりたくない
Potential	鈍にぶれる	鈍にぶれない
Passive	鈍にぶられる	鈍にぶられない
Causative	鈍にぶらせる	鈍にぶらせない
Causative passive	鈍にぶらせられるalso 鈍にぶらされる	鈍にぶらせられないalso 鈍にぶらされない
Volitional	鈍にぶろう
Polite volitional	鈍にぶりましょう
Imperative	鈍にぶれ	鈍にぶるな
Conditional	鈍にぶれば	鈍にぶらなければ
Tara conditional	鈍にぶったら	鈍にぶらなかったら

Meanings

godan verb (-ru), intransitive verb

become blunt; grow dull

Describes a blade, tool, or edge losing sharpness. Also used figuratively for senses, feelings, or mental sharpness becoming dull.

この包ほう丁ちょうはよく使つかうのですぐに鈍にぶる。
This kitchen knife gets blunt quickly because I use it often.
年としを取とると味み覚かくが鈍にぶると言いわれている。
It is said that your sense of taste dulls as you age.

godan verb (-ru), intransitive verb

weaken; decline; falter

Used for a decline in ability, performance, or intensity. Common with nouns like 動き, 勢い, 判断力, or 感覚.

疲つかれていると判はん断だん力りょくが鈍にぶる。
When you are tired, your judgment weakens.
雨あめのせいで選せん手しゅの動うごきが鈍にぶった。
The players' movements slowed down because of the rain.

See all 52 example sentences ›

Usage patterns

〈物もの〉の切きれ味あじが鈍にぶるfor the cutting edge of a tool to become dull
使つかい続つづけているうちに、このナイフの切きれ味あじが鈍にぶってきた。
After continued use, this knife's edge has become dull.
判はん断だん力りょくが鈍にぶるfor one's judgment to become dull or impaired
睡すい眠みん不ぶ足そくだと判はん断だん力りょくが鈍にぶる。
Lack of sleep dulls your judgment.
動うごきが鈍にぶるfor one's movements to become sluggish
運うん動どう不ぶ足そくで体からだの動うごきが鈍にぶっている。
Lack of exercise has made my movements sluggish.
反はん応のうが鈍にぶるfor one's reactions to become slow
お酒さけを飲のむと反はん応のうが鈍にぶる。
Drinking alcohol slows down your reactions.

Expressions

勘かんが鈍にぶるlose one's touch; become less perceptive; get out of practice
腕うでが鈍にぶるbecome less capable; lose one's touch; get rusty
決けっ心しんが鈍にぶるwaver in one's resolution; lose one's resolve

Kanji

鈍dull, slow, foolish

Related words

衰おとろえるN2sense 2
衰える describes a broader decline in strength, health, or power, while 鈍る specifically implies losing sharpness or quickness.
弱よわまるN2sense 2
弱まる is a general word for something becoming weaker in intensity, while 鈍る more specifically suggests a loss of sharpness, speed, or acuity.
鈍どん化か sense 2
鈍化する is a formal, often technical word for a rate or trend slowing down, while 鈍る is the everyday word covering both physical and figurative dulling.

Opposites

冴さえるN1sense 1
冴える describes the mind or senses becoming sharp and clear, the opposite of 鈍る, which describes them becoming dull.

Don't confuse with

鈍にぶいN3
鈍い is the adjective describing a dull or slow state, while 鈍る is the verb describing the process of becoming dull or slow.
なまる
鈍る (なまる) means 'to become dull/blunt' (of a blade, skill, or senses), while 訛る (なまる) means 'to speak with an accent'; they are pronounced identically but written with different kanji and have unrelated meanings.

Written forms

鈍るUsage87%
- にぶる
  Standard kanji spelling for the common reading にぶる.
- なまる
  Alternate reading なまる is rare and mostly seen in older or literary contexts; にぶる is the modern standard.
にぶるUsage13%
なまる

Etymology

Derived from the adjective 鈍い (にぶい, 'dull'). The verb form 鈍る follows a common pattern where an adjective stem combines with る to express 'becoming' that quality.