infallible
/ɪnˈfæləbl/adjective
1- incapable of making mistakes or being wrong不会出错的, 无误的：
doctors are not infallible.
医生不是不会犯错误的。
1.1
- never failing; always effective从不失败的; 一贯有效的：
infallible cures.
一贯有效的治疗。
1.2
- (in the Roman Catholic Church) credited with papal infallibility（罗马天主教用语）教皇阐述教义无谬误的：
for an encyclical to be infallible the Pope must speak ex cathedra.
要使教皇通谕具有永无谬误性, 教皇必须以全部职权发表意见。
派生词
infallibly
adverb词源
late 15th cent.: from French infaillible or late Latin infallibilis, from in- 'not' + Latin fallere 'deceive'.