| troubled(uncertain, nervous, worried, hesitant, insecure) |
| unclear(nervous, doubtful, shaky, vague, insecure) |
| unconfident(uncertain, nervous, worried, hesitant, insecure) |
| unconfirmed(doubtful, shaky, vague, unsure, risky) |
| undecided(nervous, doubtful, vague, insecure, unsure) |
| uneasy(shaky, unlikely, unpromising) |
| unhealthy(adjective, delicate, uncertain, sensitive, unstable) |
| unreliable(adjective, delicate, uncertain, nervous, unstable) |
| unsafe(adjective, delicate, uncertain, sensitive, unstable) |
| unsettled(adjective, open, delicate, uncertain, unstable) |
| unsound(adjective, delicate, uncertain, sensitive, unstable) |
| unstable(adjective, delicate, uncertain, nervous, doubtful) |
| unsteady(adjective, delicate, uncertain, unstable, doubtful) |
| unsure(adjective, delicate, uncertain, nervous, unstable) |
| up for grabs(expression, idiom, nervous, doubtful, shaky) |
| up in the air(expression, idiom, uncertain, doubtful, worried) |
| uptight(uncertain, nervous, worried, hesitant, insecure) |
| vague(uncertain, nervous, doubtful, worried, hesitant) |
| venturesome(delicate, uncertain, unsound, dangerous, hazardous) |
| wicked(adjective, delicate, uncertain, sensitive, unsound) |