infallibility
/ɪnˌfæləˈbɪlətɪ; ɪnˌfælə`bɪlətɪ/ n[U]
1 complete freedom from the possibility of being wrong 绝对正确; 断无错误
the doctrine of Papal infallibility 教皇无谬说的教义.
2 absolute certainty of effectiveness 绝对有效
I can't claim infallibility for this method. 我不敢说这方法绝对有效.