Simple as in castle in the air A fanciful or unrealistic idea or project, similar to being in a fool's paradise. Clear All
3 Example Sentences Showcasing the Meaning of 'Castle In The Air'
Little Timmy's dream of befriending a talking unicorn remained a castle in the air.
The child's wish for a pet dragon was just a castle in the air.
Building a house of candy proved to be a castle in the air for the baking competition.
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