I. |ən+ adjective
Etymology: un- (I) + mentionable
: not mentionable : unspeakable , hush-hush
suffered unmentionable cruelties — M.R.Cohen
open discussion of formerly unmentionable topics
II. noun
( -s )
: one that is not to be mentioned or discussed
a long list of advertising unmentionables — Time
as
a. unmentionables plural : trousers
chaste young men in checked unmentionables — Cyril Pearl
b. unmentionables plural : underwear
having trouble with public laundries shrinking my unmentionables — Reader's Digest