adjective
EXAMPLES FROM CORPUS
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Divorce, desertion, and illegitimacy were considered almost unmentionable scandals.
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Let us begin with a few simple, crucial, and apparently unmentionable facts about a typical high-school classroom.
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Miguelito yelled up that the man should do something unmentionable to himself.
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She hoped she hadn't caught an unmentionable disease from her visit to the news-theatre.
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Stalin had long been unmentionable and Volkogonov was said to be using closed secret archives.
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This behaviour was unmentionable a few years before, although it probably did take place.