- causing or tending to cause death; fatal; lethal: a deadly poison.
- aiming to kill or destroy; implacable: a deadly enemy.
- like death: a deadly pallor.
- excruciatingly boring: The dinner party was absolutely deadly.
- excessive; inordinate: deadly haste.
- extremely accurate: Annie Oakley was a deadly shot.
- in a manner resembling or suggesting death: deadly pale.
- excessively; completely: deadly dull.
Origin of deadly
SynonymsSee more synonyms for deadly on Thesaurus.com
1. See fatal. 4. dull, tedious, tiresome.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for deadliness
We are not talking about an end to spree killing, only about a (perhaps) very slight reduction in its deadliness.There's Little We Can Do to Prevent Another Massacre
December 17, 2012
There was the deadliness of the story: its lack of malice, even of resentment.Alice Adams
Silently and with deadliness apparent in every move they approached him.In the Orbit of Saturn
Roman Frederick Starzl
Slander nips it like a frost; in deadliness it is second only to ridicule.Mistress Wilding
But the knowledge of his deadliness kept him from being made a target.When the West Was Young
Frederick R. Bechdolt
As to Navel-ill, much has been written on the deadliness of the complaint.Cattle and Cattle-breeders
- likely to cause deathdeadly poison; deadly combat
- informal extremely boring
- like death in appearance or certaintydeadly pale; a deadly sleep
Word Origin and History for deadliness
Online Etymology Dictionary, © 2010 Douglas Harper