| ulterior(adjective, cover, obscure, secret, pertaining) |
| undefined(adjective, uncertainty, uncertain, doubtful, vague) |
| undetermined(adjective, open, rough, determined, uncertain) |
| unspecific(adjective, vague, unknown, general, unclear) |
| agnostic(uncertain, hesitant, dubious, unsure) |
| amorphous(unclear, indistinct, indistinguishable) |
| apocryphal(adjective, fake, questionable) |
| arcane(adjective, obscure, difficult, dark, strange) |
| bawdy |
| bewildering(adjective, awkward, uneasy, unclear, uncomfortable) |
| blurred(unclear, indistinct, indistinguishable) |
| capricious |
| changeable(hesitant, wavering, indecisive) |
| clear as mud(expression, adjective, idiom, uncertain, doubtful) |
| contingent(adjective, delicate, uncertain, unstable, limited) |
| dazed |
| devious(adjective, restrained, irregular, suspicious, shady) |
| dicey(adjective, delicate, uncertain, unstable, doubtful) |
| disputable(uncertain, doubtful, vague, dubious, suspect) |
| distrustful(uncertain, hesitant, dubious, unsure) |