castle in the air

1.
Internationalinformalliterary
- An impractical or unrealistic idea, plan, or hope that is unlikely to be realized.
- A fanciful scheme or wishful thought based on imagination rather than practical considerations.
2.
Internationalliteraryneutral
- An imaginary or dreamlike place of comfort or delight; a mental refuge of daydreams and fantasies.

Examples:

No examples available.