I thought of infallible , but it does not describe the person rather the behaviour. As in -- the person acts infallible.

Narcissist is a clinical term, and I want to avoid that.

  • 1
    Infallible does describe the person (consider the Pope), and 'the person acts infallible' is not grammatical. Commented Oct 31, 2022 at 8:19
  • Please mind that it should be "the person acts infallibly" instead of "infallible".
    Commented Oct 31, 2022 at 11:16
  • 1
    I think it should be 'acts as if infallible'. 'Acts infallibly' suggests that he actually is infallible. However, I think the OP wanted a word rather than a phrase.
    – PRL75
    Commented Oct 31, 2022 at 11:27
  • To my Canadian ears, "acts infallible" is grammatical and means the same as "acts as if he is infallible" or more precisely, "puts on an act which indicates he is infallible".
    – gotube
    Commented Oct 31, 2022 at 17:13
  • Well, if you accept other adjectives like stupid or silly, then, you have to accept infallible, too.
    – Lambie
    Commented Nov 1, 2022 at 14:58

2 Answers 2


Possibly 'arrogant'.

That describes more behaviours than simply not believing you are capable of mistakes, but it does encompass the required meaning.

'Know all' is close to what you require, but does not always imply that the person described won't admit errors.


I'm afraid there is no such word to describe such person. Supercilious or know-it-all come close. You can mock him or her as “ever- victorious general” in China, or “steady winner“ or ”who never fail“

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