Pluralistic ignorance
In social psychology, pluralistic ignorance is a situation in which a majority of group members privately reject a norm, but go along with it because they incorrectly assume that most others accept it. This is also described as "no one believes, but everyone thinks that everyone believes". In short, pluralistic ignorance is a bias about a social group, held by the members of that social group.
Invincible ignorance (Catholic theology)
When and how the term was taken by logicians to refer to the very different state of persons who pigheadedly refuse to attend to evidence (see Invincible ignorance fallacy) remains unclear, but one of its first uses was in the 1959 book "Fallacy: The Counterfeit of Argument " by W. Ward Fearnside and William B. Holther.