deaf as an adder = deaf as a post
completely or extremely deaf
The traditional deafness of an adder is based on an image in Psalm 58 : 4 : the deaf adder that stoppeth her ear.
RELATED IDIOMS :
fall on deaf ears
(of a statement or request) be ignored by others
1990 - Ellen Kuzwayo - Sit Down and Listen – All efforts by her husband to dissuade her from wishing to leave fell on deaf ears.
deaf as a post :
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