deadly

[ded-lee]

adjective, dead·li·er, dead·li·est.

adverb

in a manner resembling or suggesting death: deadly pale.
excessively; completely: deadly dull.

Origin of deadly

before 900; Middle English deedli(ch), Old English dēadlīce. See dead, -ly
Related formsdead·li·ness, nounnon·dead·ly, adjective
Can be confuseddeadly deathly

Synonyms for deadly

1. See fatal. 4. dull, tedious, tiresome.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


Examples from the Web for deadly

Contemporary Examples of deadly

Historical Examples of deadly

  • The mosquito, quite ignored, would then have gone on in his deadly work.

    'Tis Sixty Years Since

    Charles Francis Adams

  • A choice had been put before her in deadly earnest; she had refused to make one.

    Viviette

    William J. Locke

  • Robin's pale, blank face had a sick look, a deadly smoothness.

  • One of its most deadly weapons is fatigue, or the simulation of fatigue.

  • So, she went through the inferno of days and nights in a dreariness of suffering that was deadly.

    Within the Law

    Marvin Dana


British Dictionary definitions for deadly

deadly

adjective -lier or -liest

likely to cause deathdeadly poison; deadly combat
informal extremely boring

adverb, adjective

like death in appearance or certaintydeadly pale; a deadly sleep
Derived Formsdeadliness, noun
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 deadly
adj.

Old English deadlic "mortal, subject to death," also "causing death;" see dead + -ly (1). Meaning "having the capacity to kill" is from late 14c. (Old English words for this included deaðbærlic, deaðberende).

Online Etymology Dictionary, © 2010 Douglas Harper