| conjectural(doubtful, unsettled, vague, unsure, indefinite) |
| explosive |
| flimsy(adjective, doubtful, unlikely, implausible, unsubstantiated) |
| inconsistent(adjective, irregular, unpredictable, unreliable) |
| on thin ice(expression, adjective, idiom, delicate, uncertain) |
| open(adjective, uncertain, nervous, unstable, doubtful) |
| parlous |
| suspect(uncertain, doubtful, shaky, dubious, tricky) |
| tentative(adjective, open, uncertain, doubtful, vague) |
| touch and go(expression, adjective, idiom, delicate, uncertain) |
| trustless(adjective, unreliable, insecure, treacherous, incalculable) |
| undetermined(open, uncertain, doubtful, vague, dubious) |
| unforeseeable(doubtful, vague, changeable, unsure, erratic) |
| up in the air(expression, adjective, idiom, open, uncertain) |
| vacillating(adjective, uncertain, nervous, doubtful, vague) |
| volatile(adjective, unusual, uncertain, unstable, irregular) |
| wobbly(adjective, uncertain, nervous, unstable, doubtful) |
| accident-sensitive(adjective, unreliable, insecure, treacherous, incalculable) |
| accidental |
| acting |