From Longman Dictionary of Contemporary Englishinfalliblein‧fal‧li‧ble /ɪnˈfæləbəl/ adjective 1 CORRECTalways right and never making mistakes OPP fallible No expert is infallible. an infallible memory2 EFFECTIVEsomething that is infallible always works or has the intended effect → fail-safe He had an infallible cure for a hangover. —infallibly adverb —infallibility /ɪnˌfæləˈbɪləti/ noun [uncountable]
Examples from the Corpus
infallible• Banks claim their cash-dispensing computers are infallible.• Computer spell checkers are useful but far from infallible.• Having been divorced three times, Aden admits he's far from infallible.• Juries are not infallible. Innocent people are convicted, and guilty people go free.• DNA testing is an almost infallible method of identification.• There is no infallible way of predicting exactly what the weather will be like. 