Jisho

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Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no', Noun
1. outrageous; preposterous; scandalous; inexcusable; absurd; execrableYojijukugo (four character compound)
Other forms
言語道斷 【ごんごどうだん】言語同断 【ごんごどうだん】
Notes
言語道斷: Out-dated kanji or kanji usage. 言語同断: Irregular kanji usage.

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