Longman Dictionary of Contemporary English
stone deaf
adjective
EXAMPLES FROM CORPUS
▪ It was almost impossible to tell them apart, except that Arthur was stone deaf.
▪ That was another of Eunice Snell's theories, that he was a bit weak in the head and probably stone deaf too.
▪ The following morning she was struck with a heavy fever and by the end of the day she was stone deaf.
Wiktionary
stone deaf
a. (context idiomatic English) Utterly deaf.
Usage examples of "stone deaf".
God had turned a stone deaf ear to the miners and Vincent had not been able to soften Him.
You'd be surprised at the number of policemen in this state who are either illiterate or stone deaf.
By the time they were born, when she was two years old, she was already stone deaf.