Crossword Genius

Dreadful (11)

Ross

'dreadful' is the definition.
(synonyms)

This is all the clue.

(Other definitions for unspeakable that I've seen before include "Is impossible pronunciation so" , "awful?" , "dreadful" , "The hardest tongue twisters are" , "Was Marcel Marceau's act so" .)

I've seen this clue in The Guardian.
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