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Meaning of Pollyanna

Pol•ly•an•na

Pronunciation: (pol"ē-an'u), [key]
— n.
  1. an excessively or blindly optimistic person.
—adj.
  1. (often l.c.) unreasonably or illogically optimistic: some pollyanna notions about world peace.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.