unmentionable

adj.

说不出口的，不堪提起的；为人所不齿；说不得；

1. Some of the crimes committed during the war are unmentionable.
   有些战争期间的犯罪行为让人简直说不出口。
2. He has got some unmentionable disease.
   他患了一些不堪提起的疾病。

Unmentionable cuisine
Do Unmentionable Products Still Exist?
The Unmentionable Nechaev: A Key to Bolshevism
Sexual Violence: The Unmentionable Sin
Glimpses of the Unmentionable in the History of British Social Anthropology
A World of Unmentionable Suffering: Women's Public Conveniences in Victorian London
Intentional over-treatment: the unmentionable conflict-of-interest.
Naming the Unmentionable: How Children Exposed to Intimate Partner Violence Articulate Their Experiences
Music in Advertisements for Unmentionable Products—A Classical Conditioning Experiment
Michael Goodich, The Unmentionable Vice: Homosexuality in the Later Medieval Period. Santa Barbara: American Bibliographical Center;...