Unmentionable
ahd-5
adjective.
Not fit to be mentioned or discussed; unspeakable.
noun.
One that is not to be mentioned.
noun.
Underclothes.
The Century Dictionary and Cyclopedia
Incapable of being mentioned; unworthy of or unfit for being mentioned, named, or noticed.
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
Not
mentionable
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a garment worn under other garments
adjective.
unsuitable or forbidden as a topic of conversation
Word Usage
"However, I am irrationally obsessed with the idea of mosquito bites in unmentionable places."