Dictionary

infallible

adjective in·fal·li·ble \(ˌ)in-ˈfa-lə-bəl\

: not capable of being wrong or making mistakes : not fallible

: certain to work properly or succeed

Full Definition of INFALLIBLE

1
:  incapable of error :  unerring <an infallible memory>
2
:  not liable to mislead, deceive, or disappoint :  certain <an infallible remedy>
3
:  incapable of error in defining doctrines touching faith or morals
in·fal·li·bil·i·ty \-ˌfa-lə-ˈbi-lə-tē\ noun
in·fal·li·bly \-ˈfa-lə-blē\ adverb

Examples of INFALLIBLE

  1. I never claimed to be infallible.
  2. There is no infallible remedy to these problems.

Origin of INFALLIBLE

Middle English, from Medieval Latin infallibilis, from Latin in- + Late Latin fallibilis fallible
First Known Use: 15th century

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