(|)i, (|)ir, (|)iə, ə+ adjective
Etymology: Latin irresolubilis, from in- in- (I) + resolvere to resolve + -bilis -ble — more at resolve
1. archaic : incapable of being dissolved or resolved into parts : insoluble
2. archaic : incapable of being relieved or dispelled
3. : incapable of being solved : impossible to make open, clear, or simple
the question is irresoluble on the evidence at hand