JMdict: 1607660

オンチ 【おんち】

1. [n,adj-no,adj-na] tone deafness; amusia; having no ear for music
2. [n-suf] having no sense of (e.g. direction); being hopeless when it comes to (e.g. computers); -illiterate

Words often seen with this one: (experimental feature)

方向 (39), 運動 (29), 私 (16), ちょっと (13)