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Related to Adders: half adders, subtractors

deaf as an adder

Unable to hear anything. The deafness of an adder is referred to in the Bible. A: "I'm shouting, and he's ignoring me!" B: "Oh, he's deaf as an adder! Write down whatever you're trying to communicate to him." What are you, deaf as an adder? You hear me calling you for dinner, so get in here!
See also: adder, deaf
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

*deaf as a post

deaf. (*Also:as ~.) When my cousin was a teenager, she played her drum set without ear protection, and she was as deaf as a post by the age of twenty-five. Mark can't hear you even if you shout; he's deaf as a post.
See also: deaf, post
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

deaf as a post

Also, deaf as an adder. Unable to hear or to listen, as in Speak louder, Grandpa's deaf as a post. The first simile has its origin in John Palsgrave's Acolastus (1540): "How deaf an ear I intended to give him ... he were as good to tell his tale to a post." It has largely replaced deaf as an adder, alluding to an ancient belief that adders cannot hear; it is recorded in the Bible (Psalms 58:3-5).
See also: deaf, post
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

deaf as a post

If someone is as deaf as a post, they are very deaf. My Dad is as deaf as a post.
See also: deaf, post
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

deaf as an adder (or 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’.
See also: adder, deaf
Farlex Partner Idioms Dictionary © Farlex 2017

(as) deaf as a ˈpost

(informal) unable to hear anything: You’ll have to shout if you want her to hear you. She’s as deaf as a post.
See also: deaf, post
Farlex Partner Idioms Dictionary © Farlex 2017

deaf as a post

Unable to hear or to listen. The simile dates from the sixteenth century, when J. Palsgrave wrote (Acolastus, 1540), “He wotteth ful lyttel how deffe an eare I intended to gyue him . . . he were as good to tell his tale to a poste.” It caught on and has survived to the present, outliving such similes as deaf as an adder (first recorded in the Book of Psalms, 58:4–5), deaf as a beetle, and deaf as a white cat. See also fall on deaf ears; turn a blind eye/deaf ear.
See also: deaf, post
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
THE DANGERS Adders are the UK's only venomous snake and usually hibernate from October to April.
An adder's poison is generally of little danger to humans but can be very painful and cause a nasty inflammation.
He said: "We have started to see reports of adder bites on dogs in other areas over the past couple of weeks.
Fewer than one in 20 adder bite victims die, says the Veterinary Poisons Information Service.
"Adders are a grey colour and have an inverted 'V' on their back," Geraint said.
Bites are more frequent in the spring when the snakes are just out of hibernation, and now dog owners are urged to keep their pets on a lead in known adder territiory.
With more than six months of hard work and dedication, the team successfully created a new world record by making the first 5-bit adder using dominoes.
Being cold blooded, adders lie dormant underground in winter but as the weather warms up they start basking and survive mainly on small rodents and slow worms.
Over a 12-year period, four of the 14 cases of berg adder envenomation dealt with by the TPIC have been from the Betty's Bay region.
Shows the full adders and gates used in the design.
But if more people are to have this experience, we need to ensure adders and their habitat are protected.
So that, carry-propagate multi-operand adders are employed for the partial product reduction scheme.
(i) Decompose the addition as two adders: one is a full adder for adding the two least significant bits of the input operands with the incoming carry, and another is a 3-bit adder with add-3 correction merged for the remaining bits.