pipe dream

• Espoir ou projet irréaliste, impraticable ou fantaisiste, qui a très peu de chances de se réaliser.

An unrealistic, impractical, or fanciful hope or plan that is unlikely to ever come true.

1. Unrealistic hopeB2informal

   An unrealistic or impossible hope, plan, or idea that is unlikely to ever happen.

   chimère

   • His plan to become a millionaire overnight is just a pipe dream.
   • She dismissed the idea of moving to Mars as a pipe dream.
   • Thinking you can learn a language in a week is a pipe dream.