Adjective

(head)

of or relating to sound

having a speed approaching that of the speed of sound in air

Adjective

(en adjective)

Capable of giving out a deep, resonant sound.

* {{quote-book

, year= 1837 , year_published= , author= , by= , title= , url= http://books.google.com/books?id=DfIsAAAAYAAJ&pg=PA162 , original= , chapter= Mercury de Breze , section= , isbn= , edition= , publisher= , location= New York , editor= , volume= 2 , page= 162 , passage= The Oath is redacted ; pronounced aloud by President Bailly, — and indeed in such a sonorous tone, that the cloud of witnesses, even outdoors, hear it, and bellow response to it. }}

Full of sound and rich, as in language or verse.

* Addison

The Italian opera, amidst all the meanness and familiarity of the thoughts, has something beautiful and sonorous in the expression.

* E. Everett

There is nothing of the artificial Johnsonian balance in his style. It is as often marked by a pregnant brevity as by a sonorous amplitude.

Wordy or grandiloquent.