不切实际 unrealistic
Explanation
指脱离实际情况，不符合客观规律。
Refers to something detached from reality, not conforming to objective laws.
Origin Story
小明梦想成为一名宇航员，他每天都看着星星，想象着自己驾驶宇宙飞船遨游太空。他认真研究各种航天知识，甚至设计了一艘他认为完美的宇宙飞船，还画出了详细的图纸。然而，他的身体条件并不适合成为宇航员，而且他的设计也缺乏实际的工程基础，他的梦想虽然很宏伟，却显得有些空中楼阁，不切实际。他需要认识到，梦想固然重要，但更重要的是脚踏实地，一步一步地为之努力，将梦想与现实结合起来。也许，成为一名出色的工程师，设计出更先进的宇宙飞船，也是一种实现他梦想的方式。
Xiaoming dreamed of becoming an astronaut. Every day, he looked at the stars and imagined himself piloting a spaceship, soaring through space. He studied various aerospace knowledge carefully and even designed a spaceship he considered perfect, drawing detailed blueprints. However, his physical condition was not suitable for being an astronaut, and his design lacked practical engineering foundations. His dream, while grand, seemed somewhat impractical and unrealistic, like a castle in the air. He needed to realize that while dreams are important, what matters more is to be down-to-earth and work towards them step by step, integrating dreams and reality. Perhaps becoming an excellent engineer and designing more advanced spaceships would also be a way to fulfill his dream.
Usage
常用作谓语、定语；多用于否定句。
Often used as a predicate or attributive; mostly in negative sentences.
Examples
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他的计划不切实际，根本无法实现。
tā de jìhuà bù qiē shíjì, gēnběn wúfǎ shíxiàn
His plan is unrealistic and cannot be achieved.
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不要做一些不切实际的幻想。
bùyào zuò yīxiē bù qiē shíjì de huànxiǎng
Don't have unrealistic fantasies.
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这个方案太不切实际了，我们需要重新制定。
zhège fāng'àn tài bù qiē shíjì le, wǒmen xūyào chóngxīn zhìdìng
This plan is too unrealistic; we need to revise it.