Shirabe
鈍ら
English jmdict
1
adjectival nouns or quasi-adjectives (keiyodoshi) word usually written using kana alone blunt (e.g. sword);dull
このナイフはなまくらで切れない。
This knife is so dull that it can't cut.
2
adjectival nouns or quasi-adjectives (keiyodoshi) lazy;cowardly;good for nothing
Other forms 鈍 【なまくら】

鈍るにぶる

Common Godan Intransitive
English jmdict
1
Godan verb with 'ru' endingintransitive verb to become blunt;to grow dull
テレビは創造力を鈍らせる力がある。
Television can dull our creative power.
2
Godan verb with 'ru' endingintransitive verb to become less capable;to weaken;to falter
インフレ進行度は鈍っている。
The rate of inflation is slowing down.