Etymology
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unmentionable (adj.)

"that may not be or should not be mentioned," 1833, from un- (1) "not" + mentionable (adj.). Humorous use of unmentionables "trousers" is attested by 1806 (see inexpressible); from 1910 as "underwear," both on notion of "articles of dress not to be mentioned in polite circles."

updated on December 26, 2018

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Definitions of unmentionable from WordNet
1
unmentionable (n.)
a garment worn under other garments;
Synonyms: undergarment
2
unmentionable (adj.)
unsuitable or forbidden as a topic of conversation;
unmentionable words
From wordnet.princeton.edu, not affiliated with etymonline.