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"By day three of lying on the beach, their vacation excitement turned into ennui."
"After quitting her job without a plan, she felt more ennui than freedom."
"He scrolled for hours out of pure ennui, not out of interest in any certain topic."
French, mid-17th century
"Ennui" is a French loanword, but the meaning has shifted from its origin. In Old French, "enui" meant "annoyance," and in English the usage is closer to ...