遥不可及

遙不可及
yáobùkějí
  1. unattainable
  2. far-fetched
  3. out of reach
  4. exceedingly remote or distant

CEDICT

far and unreachable

Wiktionary

距离遥远无法到达，不可希冀。

重編國語辭典

Examples

书中满是遥不可及、没有科学根据的理论。

The book is full of far-flung theories without any basis in scientific fact.

Source: Tatoeba

Entry Composition

1 遥 yáo (bound form) distant; remote; far away
2 不可及 bùkějí to be inaccessible or unreachable

Related entries

牵强 qiānqiǎng
  1. far-fetched
  2. implausible (chain of reasoning)
这可能听起来牵强，但却是个真实的问题。

It might sound far-fetched, but this is a real problem.

Source: Tatoeba