un·men·tion·a·ble

[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

un·men·tion·a·ble·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unmentionable (ʌnˈmɛnʃənəbəl) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Unmentionable is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a stew of meat, vegetables, potatoes, etc.
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
As for the disease that was for so many years unmentionable, it is now being slowly un- masked.
Then he pulled off a risky move-he found a way to mention the unmentionable.
It is a place where the unthinkable can be thought, the unmentionable can be challenged.
Early in the meeting an older worker stood up and asked openly about the trials, for years an unmentioned and unmentionable topic.
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