[ uhn-men-shuh-nuh-buhl ]
See synonyms for: unmentionableunmentionables on Thesaurus.com

  1. not mentionable; inappropriate, unfit, or improper for mention, as in polite conversation; unspeakable.

  1. something that is not to be mentioned: That subject was classed among the unmentionables.

  2. unmentionables,

Origin of unmentionable

First recorded in 1820–30; un-1 + mentionable

Other words from unmentionable

  • un·men·tion·a·ble·ness, noun

Words Nearby unmentionable

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use unmentionable in a sentence

  • Polly called her a once unmentionable name that was coming into fashionable use after a long exile.

    The Cup of Fury | Rupert Hughes
  • Nibletts certified the cause of death as that unmentionable complaint, the pip.

  • Each looked as though the other were something unmentionable, left over from the last cleaning of the cesspool.

    Feet Of Clay | Phillip Hoskins
  • So we walked to the door, and we threw it open, and we stepped together into the house of the unmentionable Times.

    Anthem | Ayn Rand

British Dictionary definitions for unmentionable


/ (ʌnˈmɛnʃənəbəl) /

    • unsuitable or forbidden as a topic of conversation

    • (as noun): the unmentionable

Derived forms of unmentionable

  • 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