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noun (common) (futsuumeishi), nouns which may take the genitive case particle 'no', adjectival nouns or quasi-adjectives (keiyodoshi)
tone deafness, amusia, having no ear for music
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あいつ、自分が音痴だってこと知らないんだよ。
He doesn't realise that he's tone deaf.
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noun, used as a suffix
having no sense of (e.g. direction), being hopeless when it comes to (e.g. computers), -illiterate