Unable to hear or unwilling to listen; completely deaf. Also 'deaf as an adder.'
Examples:
- Speak louder, Grandpa's deaf as a post.
Origin: Origin in John Palsgrave's Acolastus (1540); 'deaf as an adder' alludes to an ancient belief recorded in the Bible (Psalms 58:3–5).
Synonyms: deaf as an adder