pie in the sky in Polish
pie in the sky in Polish
zamki na lodzie
(idiomatic) A fanciful notion; an unrealistic or ludicrous concept; the illusory promise of a desired outcome that is unlikely to happen.
marzenie ściętej głowy
(idiomatic) A fanciful notion; an unrealistic or ludicrous concept; the illusory promise of a desired outcome that is unlikely to happen.
nierealny
(idiomatic) Lacking reality and serviceability.
utopijny
(idiomatic) Of a dream unlikely to ever come true; impractical, unrealizable.