Necessarily or demonstrably true; incontrovertible.
Free from error
Bound to be successful or perform as expected:
Being without defect or blemish:
Never ceasing or falling short; inexhaustible
That can be relied on; dependable; trustworthy
With no exception or qualification; unexceptionable
Authoritative is defined as someone who knows a great deal about a certain subject and who is generally considered an expert.
Positive is defined as good, looking towards the good side of things, showing certainty, showing the presence of an illness or substance, more than zero, or charged with positive electricity.
The definition of incontrovertible is something that is definitely true and that cannot be denied or disproved.
Capable of compensating automatically and safely for a failure, as of a mechanism or power source.
Not true; in error; incorrect; mistaken
Careful and exact
Capable of being relied on; dependable:
That can be depended on; trustworthy; reliable
Divine means relating to God or extremely good.
Being entirely without flaw or imperfection.
Without defect or error; faultless; flawless
Not erring; infallible
That cannot be doubted, questioned, or disputed; absolutely true; certain
That cannot be denied; indisputable
Tending or likely to be erroneous:
Not finished or complete; lacking in something
Worthy of trust; dependable; reliable
Marked by or exhibiting a lack of reliability.
The definition of faulty is something unreliable or that doesn't work, or an incorrect thought pattern.
Find another word for infallible. In this page you can discover 39 synonyms, antonyms, idiomatic expressions, and related words for infallible, like: apodictic, unerring, sure-fire, secure, exact, perfect, unfailing, reliable, unquestionable, true and authoritative.