Victorian Era euphemism, specifically the category of euphemism known as indirection (compare privates, behind, sleep together). First intended meaning was "trousers", attested from 1823. Meaning "underwear" is recorded from 1910.
unmentionables pl (plural only)
plural of unmentionable
(plurale tantum) undergarments, underwear, drawers
(plurale tantum) genitals
(plurale tantum, obsolete) breeches, trousers
Because of a euphemism's intentional ambiguity, the perceived meaning can drift. While at first, "unmentionables" referred with Victorian hyper-sensitivity to trousers, the functional meaning drifted expediently to underwear. Currently, examples can be found where it is clear the writer or speaker means to refer expressly to the genitals.
Source: Wiktionary
Un*men"tion*a*bles, n. pl.
Definition: The breeches; trousers. [Jocose]
Source: Webster’s Unabridged Dictionary 1913 Edition
20 June 2025
(adjective) marked by simplicity; having a humble opinion of yourself; “a modest apartment”; “too modest to wear his medals”
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