愚痴【ぐち】
idle complaint, grumble, moha (ignorance, folly)
音痴【おんち】
tone deafness, amusia, having no ear for music, having no sense of (e.g. direction), being hopeless when it comes to (e.g. computers), -illiterate
白痴【はくち】
idiot, retard, idiocy, profound mental retardation