unmentionable

[uhn-men-shuh-nuh-buhl]
adjective
1.
not mentionable; inappropriate, unfit, or improper for mention, as in polite conversation; unspeakable.
noun
2.
something that is not to be mentioned: That subject was classed among the unmentionables.
3.
unmentionables.
b.
(formerly) trousers or breeches.

Origin:
1820–30; un-1 + mentionable

unmentionableness, noun
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World English Dictionary
unmentionable (ʌnˈmɛnʃənəbəl)
 
adj
a.  unsuitable or forbidden as a topic of conversation
 b.  (as noun): the unmentionable
 
un'mentionableness
 
n
 
un'mentionably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

unmentionable
1837, from un- (1) "not" + mentionable (see mention (v.)). Unmentionables "trousers" is attested from 1823; meaning "underwear" is recorded from 1910.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Then he pulled off a risky move-he found a way to mention the unmentionable.
Early in the meeting an older worker stood up and asked openly about the trials, for years an unmentioned and unmentionable topic.
It is a place where the unthinkable can be thought, the unmentionable can be challenged.
As for the disease that was for so many years unmentionable, it is now being slowly un- masked.
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