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Adjective: deafened  de-fund
  1. Caused to hear poorly or not at all
    "The mother learned how to read lips to help her deafened son"
Verb: deafen  de-fun
  1. Be unbearably loud
    "a deafening noise"
  2. Make or render deaf
  3. Make soundproof
    "deafen a room"

See also: deaf

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