WordWeb Online

1. Loud enough to cause (temporary) hearing loss
   "A loud, one-note wail, long and deafening, sounded from outside";
   - earsplitting, thunderous, thundery

1. Be unbearably loud
   "a deafening noise"
    
2. Make or render deaf
    
3. Make soundproof
   "deafen a room"

See also: loud

Type of: break, damp, dampen, desensitise [Brit], desensitize, soften, weaken

Encyclopedia: Deafening