Pollyanna is the name of a book which was made into a Disney movie starring Haley Mills. Pollyanna was an optimist, and the term is used to refer to someone who is relentlessly cheerful.
Pollyannas refers to people who are excessively optimistic or possess an overly positive outlook on life, sometimes to the point of being unrealistic. This term comes from the novel "Pollyanna" by Eleanor H. Porter, which features a protagonist who always looks at the bright side of things.
Pollyanna is the name of a book which was made into a Disney movie starring Haley Mills. Pollyanna was an optimist, and the term is used to refer to someone who is relentlessly cheerful.