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"deafening" is also used as a crossword clue. If that's what you saw, the answer is often thunderous (10 letters).
Definitions
loud enough to cause (temporary) hearing loss
Used in a sentence
“At the end of a frantic first 45 minutes, there was still time for Charlie Adam to strike the bar from 20 yards before referee Atkinson departed to a deafening chorus of jeering from Everton's fans.”
“Film and dance theory offer a productive vocabulary for considering the effects of these mutings and deafenings.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Extremely loud”9 letters
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