| trucking shot |
| uncertain(adjective, delicate, sensitive, unsettled, dubious) |
| uncertainty(noun, chance, pledge, venture, stake) |
| unconfirmed(adjective, doubtful, shaky, risky, unlikely) |
| underdog(noun, unknown, doubtfulness, sleeper, improbability) |
| uneasy(shaky, unlikely, unpromising) |
| unexpected winner(noun, expression, unknown, doubtfulness, underdog) |
| unhealthy(adjective, delicate, uncertain, sensitive, unsound) |
| unknown(noun, doubtfulness, underdog, sleeper, improbability) |
| unknown quantity(noun, expression, unknown, doubtfulness, underdog) |
| unlikely winner(noun, expression, uncertainty, unknown, underdog) |
| unsafe(delicate, uncertain, unsound, dangerous, hazardous) |
| unsound(adjective, delicate, uncertain, sensitive, dangerous) |
| unstable(shaky, unlikely, unpromising) |
| up for grabs(expression, adjective, doubtful, shaky, risky) |
| upsetter(noun, unknown, doubtfulness, underdog, sleeper) |
| venture(chance, risk, possibility, pledge, luck) |
| venturesome(delicate, uncertain, unsound, dangerous, treacherous) |
| wager(chance, risk, possibility, pledge, venture) |
| wicked(adjective, delicate, uncertain, sensitive, unsound) |