What is Pollyanna? and what is a "Pollyanna optimism"?

Question

I've seen it talking about a person, as an adjective or describer of personality.

Answer 1

Pollyanna was a character in a Mark Twain novel who was basically a "goody-two-shoes" who always did the right thing, was always neat and dressed perfectly and never questioned anything. Pollyanna optimism refers to a blind and unrealistic thinking that basically puts blinders over the eyes of reality.