The adjective cacophonous describes an unpleasant mixture of harsh or discordant sounds.

Synonyms are discordant, harsh, loud, or ear-splitting.

The word origins from Greek (1790-1800) kakophōnos, from kak- (or kakos) meaning “bad” plus phōnē meaning “voice” or “sound”.

Mrs. Robertson finally reported the cacophonous, partying neighbors who never let them sleep a wink at night.

Cacophonous places are the places that I hate the most.

After the announcement, the crowd was left in a cacophonous display of shock and awe.