unassailable

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un·as·sail·a·ble / ˌənəˈsāləbəl/ • adj. unable to be attacked, questioned, or defeated: an unassailable lead.DERIVATIVES: un·as·sail·a·bil·i·ty / -ˌsāləˈbilətē/ n.un·as·sail·a·bly / -blē/ adv.