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unmentionable

[uhn-men-shuh-nuh-buh l] /ʌnˈmɛn ʃə nə bəl/
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.
  1. undergarments.
  2. (formerly) trousers or breeches.
Origin
1820-1830
1820-30; un-1 + mentionable
Related forms
unmentionableness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un mentionable

unmentionable

/ʌnˈmɛnʃənəbəl/
adjective
1.
  1. unsuitable or forbidden as a topic of conversation
  2. (as noun): the unmentionable
Derived Forms
unmentionableness, noun
unmentionably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un mentionable

unmentionable

adj.

1837, from un- (1) "not" + mentionable. Unmentionables "trousers" is attested from 1823; meaning "underwear" is recorded from 1910.

Online Etymology Dictionary, © 2010 Douglas Harper
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