| negligent(adjective, unconcerned, ignorant, unconscious, heedless) |
| nescient(adjective, unconcerned, ignorant, unconscious, heedless) |
| neurotic(adjective, crazy, cuckoo, queer) |
| non compos |
| not cognizant(expression, adjective, unconcerned, ignorant, unconscious) |
| not there(expression, hacked, lunatic, undiscerning, crackbrained) |
| nougat(noun, slang, sick, mad person) |
| nut(noun, slang, sick, mad person) |
| nutcase(noun, slang, sick, mad person) |
| nutjob(noun, slang, sick, mad person) |
| nutter(noun, slang, sick, mad person) |
| nutty as a fruitcake(expression, idiom, crazy, sick, off) |
| oblivious(adjective, unconcerned, ignorant, unconscious, heedless) |
| off one's chump |
| out cold(expression, adjective, unconcerned, ignorant, unconscious) |
| out of it(expression, adjective, idiom, unconcerned, ignorant) |
| overlooking(unconcerned, unfamiliar, uninformed, undiscerning, unrecognizing) |
| reasonless |
| retarded |
| schiz(noun, slang, sick, mad person) |