| uncertain(adjective, weak, doubtful, hesitant, unsure) |
| unconsidered(passionate, violent, thoughtless, abrupt, impetuous) |
| undecided(adjective, weak, uncertain, doubtful, hesitant) |
| undetermined(adjective, weak, uncertain, doubtful, hesitant) |
| unexpected(passionate, violent, thoughtless, abrupt, impetuous) |
| unmeditated(passionate, violent, thoughtless, abrupt, impetuous) |
| unpredictable(passionate, violent, thoughtless, abrupt, impetuous) |
| unpremeditated(passionate, violent, thoughtless, abrupt, impetuous) |
| unprompted(passionate, violent, thoughtless, abrupt, impetuous) |
| unsettled(adjective, weak, uncertain, doubtful, hesitant) |
| unstable(adjective, weak, uncertain, doubtful, hesitant) |
| unsteady(adjective, weak, uncertain, doubtful, hesitant) |
| up-and-down(passionate, violent, thoughtless, abrupt, impetuous) |
| vacillating(adjective, weak, uncertain, doubtful, hesitant) |
| violent(passionate, thoughtless, abrupt, impetuous, unwary) |
| waffling(adjective, weak, uncertain, doubtful, hesitant) |
| wavering(adjective, weak, uncertain, doubtful, hesitant) |
| weak-kneed(weak, indecisive, irresolute, vacillating, palaverous) |
| wimpy(adjective, weak, uncertain, doubtful, hesitant) |
| winging it(expression, passionate, violent, thoughtless, abrupt) |