deaf

(noun) people who have severe hearing impairments. Example: "Many of the deaf use sign language."

(verb) make or render deaf. Synonyms: deafen. Example: "A deafening noise."

(adj) lacking or deprived of the sense of hearing wholly or in part. Synonyms: deaf (vs. hearing).

(adj) (usually followed by `to') unwilling or refusing to pay heed. Synonyms: deaf(predicate), indifferent(predicate). Example: "Deaf to her warnings."