deaf

adj. unable to hear; unwilling to hear, heedless

n. one who cannot hear; deaf people collectively

The word deaf is used differently in different contexts, and there is some controversy over its meaning and implications. In scientific and medical terms, deafness generally refers to a physical condition characterized by lack of sensitivity to sound. Notated as deaf with a lowercase d, this refers to the audiological experience of someone who is partially or wholly lacking hearing. In legal terms, deafness is defined by degree of hearing loss. These degrees include profound or total deafness (90 dB - 120 dB or more of hearing loss), severe (60 dB - 90 dB), moderate (30 dB - 60 dB), and mild deafness (10 dB - 30 dB of hearing loss). Both severe and moderate deafness can be referred to as partial deafness or as hard of hearing, while mild deafness is usually called hard of hearing.
See more at Wikipedia.org...

Deaf lacking the sense of hearing or not having the full power of hearing. deaf adj. 1. Partially or completely lacking in the sense of hearing. 2. [more]Deaf - Community and Resources

Noun
1. people who have severe hearing impairments; "many of the deaf use sign language"
(hypernym) people
(member-meronym) deaf person
(derivation) deafen
Verb
1. make or render deaf; "a deafening noise"
(synonym) deafen
(hypernym) desensitize, desensitise
Adjective
1. lacking or deprive of the sense of hearing wholly or in part
(antonym) hearing(a)
(similar) deaf-and-dumb, deaf-mute
2. (usually followed by `to') unwilling or refusing to pay heed; "deaf to her warnings"
(synonym) deaf(p), indifferent(p)
(similar) heedless, thoughtless, unheeding

(v. t.)
To deafen.
  

(a.)
Wanting the sense of hearing, either wholly or in part; unable to perceive sounds; hard of hearing; as, a deaf man.
  

(a.)
Unwilling to hear or listen; determinedly inattentive; regardless; not to be persuaded as to facts, argument, or exhortation; -- with to; as, deaf to reason.
  

(a.)
Obscurely heard; stifled; deadened.
  

(a.)
Deprived of the power of hearing; deafened.
  

(a.)
Decayed; tasteless; dead; as, a deaf nut; deaf corn.