Something desirable but unrealistic or unlikely to happen.
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An idea or hope that sounds wonderful but is completely unrealistic or impossible to achieve.
Pie in the sky is used to dismiss something as a dream that has no real chance of happening.
It's not always cruel — sometimes it's just a reality check.
"Wishful Thinking"
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Hoping for something that probably won't happen, without a specific idea or plan
"Pipe Dream"
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An impossible personal dream — very similar but typically more personal and private
"Pie in the Sky"
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A plan or idea that sounds great but is completely unrealistic to achieve