| strong possibility(expression, possibility, tendency, prospect, probability) |
| tendency(possibility, prospect, probability) |
| thinkability |
| thinkableness |
| toss-up(risk, possibility, tendency, prospect, stake) |
| trend(possibility, tendency, prospect, probability) |
| unbelievable(doubtful, dubious, unlikely, implausible, improbable) |
| uncertain(doubtful, unlikely, implausible) |
| uncertainty |
| unconvincing(doubtful, dubious, unlikely, implausible, improbable) |
| underdog(unknown, doubtfulness, sleeper, improbability, also-ran) |
| unexpected winner(expression, unknown, doubtfulness, underdog, sleeper) |
| unheard of(expression, adjective, doubtful, unlikely, implausible) |
| unimaginable(doubtful, dubious, unlikely, implausible, improbable) |
| unknown(doubtfulness, underdog, sleeper, improbability, also-ran) |
| unknown quantity(expression, unknown, doubtfulness, underdog, sleeper) |
| unlikely(adjective, doubtful, dubious, implausible, improbable) |
| unlikely winner(expression, fluke, underdog, sleeper, also-ran) |
| unsubstantial(doubtful, unlikely, implausible) |
| upsetter(unknown, doubtfulness, underdog, sleeper, improbability) |