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From The Collaborative International Dictionary of English v.0.48:
Unatonable \Un`a*ton"a*ble\, a. 1. Not capable of being brought into harmony; irreconcilable. "Unatonable matrimony." [Obs.] --Milton. [1913 Webster] 2. Incapable of being atoned for; inexpiable. [1913 Webster]