Dictionary/鈍化どんかDonka鈍化 (Donka) is a Japanese noun meaning “becoming dull, slowing down”.Meaningsnoun, suru verb, intransitive verbbecoming dull; slowing downKanji in 鈍化鈍dull化changeRelated words遅いslow同化assimilation軟化softening変化change老化ageing酸化oxidation悪化deterioration化け物goblin文化culture進化evolution鈍いdull (e.g. a knife)鈍いthickheaded