Many people in the kingdom believed they were half-deaf, reasoning that it would account for why they were so loud. Others believed the reason they were half-deaf was because they were so loud.

There was a saying that went about, that there is something in a "name".  But Mr. and Mrs. Loudly didn't pay heed to anything like that ...they kept living their mostly happy life in a very loud fashion, not worrying or fretting about what others may think.