| unconformable |
| unconnected(adjective, separate, reverse, distinct, inappropriate) |
| uncontaminated(adjective, unusual, strange, fresh, original) |
| undemocratic |
| unequivalent(adjective, distant, distinct, odd, different) |
| unfamiliar(adjective, unusual, strange, fresh, original) |
| unidentical |
| unknown(adjective, unusual, strange, fresh, original) |
| unresembling |
| unsame |
| unseasoned(adjective, unusual, strange, fresh, original) |
| unskilled(adjective, unusual, strange, fresh, original) |
| unspoiled(adjective, unusual, strange, fresh, original) |
| untouched(adjective, unusual, strange, fresh, original) |
| untrained(adjective, unusual, strange, fresh, original) |
| untried(adjective, unusual, strange, fresh, original) |
| untrodden(adjective, unusual, strange, fresh, original) |
| unused(adjective, unusual, strange, fresh, original) |
| unusual(adjective, strange, fresh, original, current) |
| up-to-date(adjective, unusual, strange, fresh, original) |