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
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.
2
nounhaving no sense of (e.g. direction);being hopeless when it comes to (e.g. computers);-illiterate