| tremulous(weak, unstable, unsettled, unsteady, trembling) |
| tumbledown(weak, unstable, unsettled, unsteady, trembling) |
| unassured(adjective, uncertain, nervous, doubtful, shaky) |
| uncertain(adjective, nervous, unstable, irregular, doubtful) |
| unclear(adjective, uncertain, nervous, doubtful, shaky) |
| unconfident(adjective, uncertain, nervous, doubtful, shaky) |
| unconvinced(adjective, uncertain, nervous, doubtful, shaky) |
| undependable(adjective, uncertain, nervous, unstable, doubtful) |
| undulated |
| unfirm(weak, unstable, unsettled, shaky, unsteady) |
| unguarded(unstable, vulnerable, dangerous, unprotected, precarious) |
| unnatural(irregular, unpredictable, unreliable) |
| unpredictable wandering(expression, irregular, unpredictable, unreliable) |
| unprotected(unstable, vulnerable, dangerous, precarious, unguarded) |
| unreliable(adjective, unusual, loose, uncertain, nervous) |
| unsafe(unstable, shaky, vulnerable, dangerous, unsteady) |
| unshielded(unstable, vulnerable, dangerous, unprotected, precarious) |
| unsound(weak, unstable, unsettled, risky, dangerous) |
| unsteady(weak, unstable, unsettled, shaky, vulnerable) |
| untrustworthy(adjective, uncertain, nervous, doubtful, shaky) |