Meaning of unmentionable

un•men•tion•a•ble

Pronunciation: (un-men'shu-nu-bul), [key]
— adj.
  1. not mentionable; inappropriate, unfit, or improper for mention, as in polite conversation; unspeakable.
—n.
  1. something that is not to be mentioned: That subject was classed among the unmentionables.
    1. undergarments.
    2. (formerly) trousers or breeches.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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