Infallible
Not capable of failing; unable to make mistakes.
adjectiveInfallible
Not capable of failing; unable to make mistakes.
adjectiveImagine This
The robot working in a car manufacturing plant has been tested and proven to be incapable of failing or making mistakes.
Sounds Like
in-FAL-uh-buhl
Looks Like
In(not) + fallible → Not able to fail or make mistakes; -able is a suffix meaning capable of
Remember This
Originates from Latin infallibilis (not fallible); historically associated with the concept of papal infallibility in Catholic doctrine.
Other Forms
Connect With
fallible, reliable, unerring, faultless, impeccable
Note
Avoid assuming infallibility of people; use primarily for systems, logic, or memories. In everyday speech, infallible is often exaggerated; in formal contexts it should be used cautiously.
Study Deeper
- The safety protocol was claimed to be infallible, but engineers later found a rare exception.
- Her memory seemed infallible, recalling minute details of every meeting.
From Latin infallibilis, in- (not) + fallibilis (liable to err), from fallere (to err, deceive).
IN + FALLIBLE: Remember that infallible means not able to fall into error; think of a vault that never falls, always true.
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Similar Words
Related words and words with the same part of speech.
Abstruse
adjectiveDifficult to understand; obscure or highly complex.
Accidental
adjectiveHappening by chance or without deliberate planning; not intended. In music, it is also a noun for a symbol that temporarily alters a pitch.
Acerbic
adjectiveSharp or biting in tone or taste; caustic or mordant in manner.
Acquiescent
adjectiveReady to agree or approve without protest; compliant.
Adamant
adjectiveRigid in opinion or purpose; not willing to change one's mind or position.
Adept
adjectiveHaving or showing a high level of skill or proficiency; very capable.