Advanced A fanciful or impractical idea or project, often with no basis in reality; something imagined but unlikely to happen. Clear All
5 Example Sentences Showcasing the Meaning of 'Castle In The Air'
Despite his ambitious plans, building a space station in his backyard was just a castle in the air.
The notion of a perpetual motion machine turned out to be nothing more than a castle in the air.
Winning the lottery and retiring early turned out to be just a castle in the air for Jane.
Tom's idea of a self-cleaning house sounded more like a castle in the air than a practical innovation.
Establishing a colony on Mars is currently considered a castle in the air by most scientists.
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