| meaningless(adjective, invalid, unsubstantiated, unsupported, annulled) |
| negated(adjective, meaningless, invalid, unsubstantiated, unsupported) |
| nonofficial |
| not final(expression, adjective, unsettled, indefinite, temporary) |
| not following |
| not proved |
| not settled(expression, adjective, unsettled, indefinite, temporary) |
| not viable(expression, adjective, void, meaningless, invalid) |
| nugatory(adjective, meaningless, invalid, unsubstantiated, unsupported) |
| null(adjective, meaningless, invalid, unsubstantiated, unsupported) |
| null and void(expression, adjective, idiom, void, invalid) |
| nullified(adjective, void, meaningless, invalid, unsubstantiated) |
| obscure(uncertain, doubtful, shaky, dubious, restricted) |
| on thin ice(expression, idiom, doubtful, shaky, vague) |
| on trial |
| open(shaky, unlikely, unpromising) |
| open for consideration(expression, adjective, idiom, unsettled, indefinite) |
| precarious(doubtful, shaky, vague, unsure, unlikely) |
| probationary(adjective, unsettled, indefinite, temporary, tentative) |
| problematic(uncertain, doubtful, shaky, vague, dubious) |