| problematic(adjective, unreasonable, dubious, unlikely, flimsy) |
| puzzling(adjective, unreasonable, dubious, unlikely, flimsy) |
| questionable(doubtful, dubious, unlikely, unbelievable, implausible) |
| rare(adjective, doubtful, dubious, unlikely, implausible) |
| slim(doubtful, unlikely, implausible) |
| slim and none(expression, idiom, doubtful, unlikely, implausible) |
| suspect(adjective, unreasonable, dubious, unlikely, flimsy) |
| thin(adjective, unreasonable, dubious, unlikely, flimsy) |
| too much(expression, adjective, unreasonable, dubious, unlikely) |
| unbelievable(adjective, unreasonable, doubtful, dubious, unlikely) |
| uncertain(doubtful, unlikely, implausible) |
| unconvincing(adjective, unreasonable, doubtful, dubious, unlikely) |
| unimaginable(doubtful, dubious, unlikely, implausible, improbable) |
| unsubstantial(adjective, unreasonable, doubtful, dubious, unlikely) |
| weak(adjective, unreasonable, doubtful, dubious, unlikely) |
| absurd(doubtful, dubious, improbable) |
| contrary(doubtful, dubious, improbable) |
| faint(doubtful, dubious, improbable) |
| fantastic(unlikely, unbelievable, improbable) |
| impossibilities |