deadly

[ ded-lee ]
/ ˈdɛd li /
See synonyms for: deadly / deadliest on Thesaurus.com

adjective, dead·li·er, dead·li·est.

adverb

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

QUIZZES

LEARN THE SPANISH WORDS FOR THESE COMMON ANIMALS!

Are you learning Spanish? Or do you just have an interest in foreign languages? Either way, this quiz on Spanish words for animals is for you.
Question 1 of 13
How do you say “cat” 🐈 in Spanish?

Origin of deadly

First recorded before 900; Middle English deedli(ch), Old English dēadlīce; see dead, -ly

synonym study for deadly

1. See fatal.

OTHER WORDS FROM deadly

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

WORDS THAT MAY BE CONFUSED WITH deadly

deadly , deathly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for deadly

British Dictionary definitions for deadly

deadly
/ (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 forms of deadly

deadliness, 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