| unconvinced(nervous, insecure, unsure) |
| undependable(nervous, insecure, unsure, risky, dangerous) |
| undetermined(doubtful, vague, unsure) |
| unfixed(doubtful, vague, unsure) |
| unforeseeable(doubtful, vague, unsure) |
| unlikely(shaky, unpromising) |
| unpoised(uncertain, nervous, worried, hesitant, insecure) |
| unpredictable(doubtful, vague, unsure) |
| unpromising(shaky, unlikely) |
| unprotected(susceptible, risky, nonresistant) |
| unresolved(doubtful, vague, unsure) |
| untrustworthy(nervous, insecure, unsure, risky, dangerous) |
| untrusty(nervous, insecure, unsure) |
| up the creek(expression, idiom, susceptible, risky, nonresistant) |
| vacillating(nervous, doubtful, vague, insecure, unsure) |
| variable(doubtful, vague, unsure) |
| vincible(susceptible, risky, nonresistant) |
| vulnerable(delicate, uncertain, susceptible, rugged, risky) |
| wavering(nervous, doubtful, vague, insecure, unsure) |
| weak(nervous, insecure, unsure) |