—infallibly adverb —infallibility /ɪnˌfæləˈbɪləti/ noun Examples from the Corpusinfallible• Banks claim their cash-dispensing computers are infallible. What is the best definition of infallibility? 1 : incapable of error : unerring an infallible memory. 2 : not liable to mislead, deceive, or disappoint : certain an infallible remedy. 3 : incapableRead More →