音痴 おんち
onchi

Noun
na-Adjective
no-Adjective

1. tone deafness; amusia; having no ear for music

あいつ、自分 じぶん音痴 おんちだってこと らないんだよ。
aitsu jibunga onchidatte koto shiranai ndayo.
He doesn't realise that he's tone deaf.
Suffix

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