What’s the word to describe a person who acts like they don’t make mistakes

word-request

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.

Best Answer

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.