unspeakable

adj.

无法形容的；坏不堪言的；不可说的，不应被讲出来的；说不出口

1. Their treatment of women is unspeakable.
   他们对待妇女的方式恶劣得难以言表。
2. There is something unspeakable in these outposts.
   边缘的有些地方难以名状。
3. The unspeakable odour clung to the room.
   一股难以形容的气味充斥着房间散不出去。
4. America's invasion of the country must be done for unspeakable political purpose.
   美国入侵这个国家一定是出于不可告人的政治目的。

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Speakable and Unspeakable in Quantum Mechanics: How to teach special relativity
Unspeakable Sentences: Narration and Representation in the Language of Fiction by Ann Banfield
Speaking the Unspeakable: Marital Violence Among South Asian Immigrants in the U.S. (review)
Speakable and Unspeakable in Quantum Mechanics: On the problem of hidden variables in quantum mechanics
Chapter 7. Conclusions: Speaking (of) the unspeakable : The Local Construction of a Global Language Ideologies of English in South K...