0 shocking or embarrassing, and therefore not allowed or disapproved of as a subject of conversation: --
the unmentionable possibility that we might lose the war
He said: "the intelligence community has acquired the status of an unmentionable taboo exempt from any process of rational public or parliamentary debate".
I will therefore refer to them as the unmentionable seven.
There are sound and cogent reasons why many subjects previously regarded as unmentionable should be discussed and written about in an honest and adult manner.
It is bad when a subject becomes unmentionable.
I shall not try the patience of my colleagues at this time of night by mentioning the unmentionable.
The atrocities which he has committed are almost unmentionable.
The draughts inside such a house are just unmentionable.
It was unmentionable, not because it was morally degrading or wrong.
