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female mosquitoes , the biting sex , are a deaf as a roadie for Black Sabbath . " If any of our hosts heard , they were diplomatically deaf , but I no longer wondered why they excluded strangers from their ceremonies . I read out the Welcome letter for those who had not received one already and Amber gave us all a copy of an article about Hearing Dogs For The Deaf and told us how valuable these are to deaf people in helping them to live a full life . Individuals are termed deaf if they have severe or profound hearing loss , that is , are able to hear only very loud sounds and have lost their hearing before developing spoken language . Some persons have been totally deaf since birth , while some are only late deafened as adults .