| unconscious(adjective, cold, indifferent, unresponsive, numb) |
| unconversant(unknowing, hermetical, unbriefed) |
| under-the-table(unknowing, hermetical, unbriefed) |
| under cover(expression, obscure, dark, isolated, unknowing) |
| under the table(expression, idiom, unknowing, hermetical, unbriefed) |
| undetectable |
| unexcited(isolated, reclusive, uncompanionable) |
| unforthcoming(unknowing, hermetical, unbriefed) |
| unheard of(expression, isolated, reclusive, uncompanionable) |
| unhonored(isolated, reclusive, uncompanionable) |
| unimpressible(adjective, cold, indifferent, unresponsive, numb) |
| uninformed(unknowing, hermetical, unbriefed) |
| uninstructed(unknowing, hermetical, unbriefed) |
| unintellectual(unknowing, hermetical, unbriefed) |
| unintelligible(adjective, cold, indifferent, unresponsive, numb) |
| unknowing(hermetical, unbriefed) |
| unknowledgeable(unknowing, hermetical, unbriefed) |
| unlettered(unknowing, hermetical, unbriefed) |
| unmindful(adjective, cold, indifferent, unresponsive, numb) |
| unnoted(isolated, reclusive, uncompanionable) |