- 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 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 deadlier
With a mortality rate of 70 percent, the more cases that arise, the deadlier this epidemic becomes.The Race for the Ebola Vaccine
January 7, 2015
With dozens of shootings in a weekend, the Windy City has earned another, deadlier moniker.How Chicago Became ‘Chiraq’
April 22, 2014
The tragedy in West Virginia reminds us that some careers are deadlier than others.The 20 Most Dangerous Jobs
The Daily Beast
April 8, 2010
But I bethought me of something else that would make a deadlier missile.The Strolling Saint
No deadlier instrument was ever invented by the cruelty of man.Critical Miscellanies (Vol. 1 of 3)
"Your touch is deadlier than you know, perhaps," says Mr. Browne, lightly.April's Lady
Margaret Wolfe Hungerford
The Tribune raised, for a deadlier blow, the revengeful blade.Rienzi
Edward Bulwer Lytton
There is not a surer shot, or a deadlier foe on earth then Persimmon Bill.Wild Bill's Last Trail
- likely to cause deathdeadly poison; deadly combat
- informal extremely boring
- like death in appearance or certaintydeadly pale; a deadly sleep
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for deadlier
Online Etymology Dictionary, © 2010 Douglas Harper