Compare: 鈍い vs 鈍い

鈍いのろい

thickheaded; obtuse; stupid

鈍いにぶい

dull (e.g. a knife); blunt

のろい鈍い
N5CommonI-adjective

thickheaded; obtuse; stupid

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Examples

(かれ)は理解力がのろい。

He is slow of understanding.

何て歩みののろいやつだろう。

How slow you are!

にぶい鈍い
N5CommonI-adjective

dull (e.g. a knife); blunt

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Examples

(かれ)は動作が(にぶい)い。

He is slow in action.

(かれ)は感覚が(にぶい)い。

He has dull senses.