JMdict: 1582440

鈍る 【にぶる】

  1. [v5r,vi] to become blunt; to grow dull
  2. [v5r,vi] to become less capable; to weaken; to falter
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
鈍 Dull, Slow, Foolish, Blunt ドン にぶ.い, にぶ.る, にぶ-, なま.る, なまく.ら