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Definition of deafening : 1. of Deafen
2. The act or process of rendering impervious to sound, as a floor or wall; also, the material with which the spaces are filled in this process; pugging.

Synonyms:

sounds, thundery, stentorian, overpowering, piercing, thunderous

clamorous, boisterous, strident, roaring, noisy, blaring, earsplitting, bellowing, booming, clangorous, uproarious, loud, fortissimo, blasting, vociferous, sonorous, tumultuous, blatant

Usage examples:

• The 'Evvivas' were deafening. - "The Letters of Elizabeth Barrett Browning (1 of 2)", Frederic G. Kenyon.
• Then there was a broad, flashing sea of furious foam, a deafening rush and roar, through which I heard Mr. Trelawney, who was following me, shout, " Go on, go on; don't stop!" - "Records of a Girlhood", Frances Ann Kemble.
• And so it was that they were out of harm's way when the two ships disappeared from sight with a deafening roar as the waters closed over them; they were beyond reach of the suction. - "The Boy Allies at Jutland", Robert L. Drake.