deadly

[ ded-lee ]
/ ˈdɛd li /

adjective, dead·li·er, dead·li·est.

adverb

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

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Origin of deadly

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

SYNONYMS FOR deadly

1 See fatal.
4 dull, tedious, tiresome.

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. 2020

Example sentences from the Web for deadliest

British Dictionary definitions for deadliest

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