1) Deadness exemplified 2) Deadness symbol 3) Epitome of deadness 4) Large-headed fastener 5) Nail 6) Paradigm of deadness 7) Symbol of deadness 8) Symbol of lifelessness 
• (n.) The nail or knob on which in ancient doors the knocker struck; -- hence the old saying, `As dead as a doornail.`
Door'nail` noun The nail or knob on which in ancient doors the knocker struck; -- hence the old saying, 'As dead as a doornail .' 
[n] - a nail with a large head
noun a nail with a large head; formerly used to decorate doors
a large-headed nail formerly used for strengthening or ornamenting doors. · stone-dead: After midnight, the town is dead as a doornail.