| ticklish(adjective, weak, delicate, uncertain, unstable) |
| torn |
| touch-and-go(uncertain, shaky, unclear, unlikely, questionable) |
| touch and go(expression, adjective, idiom, delicate, uncertain) |
| touchy(adjective, open, delicate, uncertain, nervous) |
| tricky(adjective, weak, delicate, uncertain, unstable) |
| ultimate(noun, top, point, limit, extreme) |
| unassured(adjective, uncertain, nervous, doubtful, shaky) |
| uncommitted |
| unconfident(adjective, uncertain, nervous, doubtful, shaky) |
| unconfirmed(uncertain, shaky, unclear, unlikely, questionable) |
| unconvinced(adjective, uncertain, nervous, doubtful, shaky) |
| undependable(adjective, uncertain, nervous, doubtful, shaky) |
| undetermined |
| unhealthy(adjective, delicate, uncertain, unstable, doubtful) |
| unpredictable(uncertain, uneven, unbalanced, questionable, unhinged) |
| unreliable(adjective, delicate, uncertain, nervous, unstable) |
| unsafe(adjective, delicate, uncertain, unstable, doubtful) |
| unsteady(adjective, weak, delicate, uncertain, unstable) |
| untrustworthy(adjective, weak, uncertain, nervous, sensitive) |