Walter Mitty - definition and synonyms

noun [countable] 

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/ˌwɔːltə(r) ˈmɪti/
singularWalter Mitty
pluralWalter Mitties
  1. someone who imagines that unusual or exciting things happen to them, but whose life is in fact very ordinary
Word story
From Walter Mitty, the main person in the short story The Secret Life of Walter Mitty by US writer James Thurber.