incontestable adjective formal uk/ˌɪn.kənˈtes.tə.bəl/ us/ˌɪn.kənˈtes.tə.bəl/
无可置疑的impossible to question because of being obviously true
There is now incontestable evidence that the killings did take place. 现在有确凿证据证明屠杀的确发生过。
Related word: incontestably