Pollyanna

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Pollyanna

the “glad child,” extraordinarily optimistic. [Children’s Lit.: Pollyanna]

Pollyanna

always finds something to be glad about. [Am. Lit.: Pollyanna; Am. Cinema: Pollyanna in Disney Films, 170–172]
References in periodicals archive ?
I don't know if it's indefatigability or Pollyannaism, but designers do have a way of recasting disadvantages.
Those who imagined that the twentieth century was the most brutal in humanity's history may be guilty of pollyannaism.