Crossword Genius

Unmentionable (5)

Ross

I believe the answer is:

taboo

'unmentionable' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for taboo that I've seen before include "Subject to prohibition" , "Not allowed, forbidden, proscribed" , "Prohibited, sacred" , "(Something) forbidden" , "Forbidden by social custom" .)

I've seen this clue in the New York Times and The Sun.
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