| unimaginable(adjective, light, extraordinary, strange, rare) |
| impossible(adjective, extraordinary, unusual, strange, unreasonable) |
| indefinite(shaky, ambiguous, unpromising) |
| moot(uncertain, doubtful, unsure, ambiguous, debatable) |
| indistinct(shaky, ambiguous, unpromising) |
| ridiculous(adjective, strange, crazy, doubtful, dubious) |
| slender(adjective, slight, remote) |
| suspect(adjective, open, obscure, uncertain, doubtful) |
| unacceptable(adjective, inappropriate, unsuitable, unsuited, inapt) |
| unpromising(adjective, inadequate, useless, shaky, inappropriate) |
| equivocal(uncertain, doubtful, unsure, ambiguous) |
| borderline(shaky, ambiguous, unpromising) |
| doubtable(adjective, open, obscure, uncertain, doubtful) |
| dubitable(adjective, uncertain, doubtful, shaky, unsure) |
| extraordinary(adjective, light, thin, strange, rare) |
| faint(adjective, slight, doubtful, remote, dubious) |
| improbably(adverb, improbably) |
| inappropriate(adjective, inadequate, useless, unhealthy, unsuitable) |
| unbecoming(adjective, inadequate, useless, inappropriate, unhealthy) |
| unclear(adjective, uncertain, doubtful, shaky, dubious) |