https://en.wikipedia.org/wiki/Ignorance

Ignorance is a state of being uninformed (lack of knowledge).[1] The word ignorant is an adjective describing a person in the state of being unaware and is often (incorrectly) used to describe individuals who deliberately ignore or disregard important information or facts. Ignoramus is commonly used in the UK, Ireland, and the US as a term for someone who is willfully ignorant. Ignorance is distinguished from stupidity, although both can lead to "unwise" acts.

He or she may also reject valid but contrary information, neither realizing its importance nor understanding it. This concept is elucidated in Justin Kruger's and David Dunning's work, "Unskilled and Unaware of It: How Difficulties in Recognizing One's Own Incompetence Lead to Inflated Self-Assessments," otherwise known as the Dunning–Kruger effect.