Synonyms of 'cacophony'
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A din is a very loud and unpleasant noise that lasts for some time.
They tried to make themselves heard over the din of the crowd.
When there is disharmony, people disagree about important things and this causes an unpleasant atmosphere.
Thesaurus for cacophony from the Collins English Thesaurus
You can describe a loud , unpleasant mixture of sounds as a cacophony .