What do you call somebody who can't see their own flaws?

Someone who can't see their own flaws is often referred to as being "self-unaware" or "self-deceived." This lack of insight can also be described as having a "blind spot" or being "in denial" about their shortcomings. In psychological terms, this can relate to concepts like the Dunning-Kruger effect, where individuals overestimate their own abilities or knowledge.