Etymology
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deaf (adj.)

Old English deaf "lacking the sense of hearing," also "empty, barren," from Proto-Germanic *daubaz (source also of Old Saxon dof, Old Norse daufr, Old Frisian daf, Dutch doof "deaf," German taub, Gothic daufs "deaf, insensate"), from PIE dheubh-, which was used to form words meaning "confusion, stupefaction, dizziness" (source also of Greek typhlos "blind," typhein "to make smoke;" Old English dumb "unable to speak;" Old High German tumb).

The word was pronounced to rhyme with reef until 18c. Meaning "refusing to listen or hear" is from c. 1200. As a noun, "deaf persons," from c. 1200. Deaf-mute is from 1837, after French sourd-muet. Deaf-mutes were sought after in 18c.-19c. Britain as fortune-tellers. Deaf as an adder (Old English) is from Psalms lviii.5.

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Definitions of deaf
1
deaf (adj.)
(usually followed by `to') unwilling or refusing to pay heed;
deaf to her warnings
Synonyms: indifferent
deaf (adj.)
lacking or deprived of the sense of hearing wholly or in part;
2
deaf (v.)
make or render deaf;
Synonyms: deafen
3
deaf (n.)
people who have severe hearing impairments;
many of the deaf use sign language
From wordnet.princeton.edu