[ ded-lee ]
/ ˈdɛd li /

adjective, dead·li·er, dead·li·est.


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

Nearby words

  1. deadhead,
  2. deadlight,
  3. deadline,
  4. deadlock,
  5. deadlocked,
  6. deadly nightshade,
  7. deadly sins,
  8. deadman,
  9. deadpan,
  10. deadrise

Origin of deadly

before 900; Middle English deedli(ch), Old English dēadlīce. See dead, -ly

1. See fatal. 4. dull, tedious, tiresome.

Related formsdead·li·ness, nounnon·dead·ly, adjective

Can be confuseddeadly deathly Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for deadlier

British Dictionary definitions for deadlier


/ (ˈdɛdlɪ) /

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 deadlier



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