infallible Meaning in the Cambridge English Dictionary
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Meaning of “infallible” in the English Dictionary

"infallible" in British English

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infallibleadjective

uk   us   /ɪnˈfæl.ɪ.bl̩/
never ​wrong, ​failing, or making a ​mistake: Even the ​experts are not infallible.
infallibility
noun [U] uk   /ɪnˌfæl.əˈbɪl.ɪ.ti/  us   /-ə.t̬i/
His ​stubbornbelief in his own infallibility ​kept him from ​listening to ​others.
(Definition of infallible from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"infallible" in American English

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infallibleadjective [not gradable]

 us   /ɪnˈfæl·ə·bəl/
never ​wrong, or never ​failing: Memory is not infallible.
infallibility
noun [U]  us   /ɪnˌfæl·əˈbɪl·ɪ·t̬i/
His ​stubbornbelief in his own infallibility ​kept him from ​listening to ​others.
(Definition of infallible from the Cambridge Academic Content Dictionary © Cambridge University Press)
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