Definition of unmentionable
(Entry 1 of 2)
: not fit or allowed to be mentioned or discussed : unspeakable
an unmentionable topic
unmentionable
nounDefinition of unmentionable (Entry 2 of 2)
: one that is not to be mentioned or discussed: such as
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Merriam-Webster unabridged
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Time Traveler for unmentionable
The first known use of unmentionable was in 1657
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