deadly

From Middle English dedly, dedlych, dedlich, from Old English dēadlīċ (adjective); corresponding to dead +‎ -ly. Cognate with Dutch dodelijk, German tödlich.

The adverb is from Middle English dedliche, from Old English dēadlīċe (adverb), from the adjective.

• IPA^(key): /ˈdɛd.li/

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deadly (comparative deadlier or more deadly, superlative deadliest or most deadly)

1. (obsolete) Subject to death; mortal.
   • 1485, Sir Thomas Malory, chapter xxij, in Le Morte Darthur, book XVII:

     And whan he cam to the sacrament of the masse / and had done / anone he called Galahad and sayd to hym come forthe the seruaunt of Ihesu cryst and thou shalt see that thou hast moche desyred to see / & thenne he beganne to tremble ryght hard / whan the dedely flesshe beganne to beholde the spyrytuel thynges

   • Wyclif Bible, Romans i. 23:

     The image of a deadly man.

2. Causing death; lethal.
   • 1949 George Orwell, Nineteen Eighty-Four, Part Two, Chapter 9,

     […] others search for new and deadlier gases, or for soluble poisons capable of being produced in such quantities as to destroy the vegetation of whole continents […]

3. Aiming or willing to destroy; implacable; desperately hostile.

   deadly enemies

   • c. 1601, William Shakespeare, Twelfth Night, Act III scene iv:

     […] Dismount thy tuck, be yare in thy preparation, for thy assailant is quick, skillful and deadly.

4. (by extension) Very accurate (of aiming with a bow, firearm, etc.).
   • 1879, R[ichard] J[efferies], chapter 1, in The Amateur Poacher, London: Smith, Elder, & Co., […], OCLC 752825175, page 035:

     But then I had the [massive] flintlock by me for protection. ¶ […] The linen-press and a chest on the top of it formed, however, a very good gun-carriage; and, thus mounted, aim could be taken out of the window […], and a 'bead' could be drawn upon Molly, the dairymaid, kissing the fogger behind the hedge, little dreaming that the deadly tube was levelled at them.

5. (informal) Very boring.
   • 1907, Robert William Chambers, chapter VI, in The Younger Set, New York, N.Y.: D. Appleton & Company, OCLC 24962326:

     “I don't mean all of your friends—only a small proportion—which, however, connects your circle with that deadly, idle, brainless bunch—the insolent chatterers at the opera, the gorged dowagers, the worn-out, passionless men, the enervated matrons of the summer capital, […]!”

   • 2001, Oliver Sacks, Uncle Tungsten: Memories of a Chemical Boyhood

     Now, at school, I was forced to sit in classes, to take notes and exams, to use textbooks that were flat, impersonal, deadly.

   • 2009, Gay Lumsden, ‎Donald Lumsden, ‎Carolyn Wiethoff, Communicating in Groups and Teams: Sharing Leadership (page 324)

     Students, of course, know the difference between a deadly lecture and a stimulating one. An excellent lecturer who maintains a high level of interaction with the audience stimulates thinking and learning.

6. (informal) Excellent, awesome, cool.

• deadliness
• deadly sin

deadly (comparative more deadly, superlative most deadly)

1. (obsolete) Fatally, mortally.
   • 1603, John Florio, transl.; Michel de Montaigne, The Essayes, […], printed at London: By Val[entine] Simmes for Edward Blount […], OCLC 946730821:

     , Folio Society, 2006, p.16:

     perceiving himselfe deadly wounded by a shot received in his body, being by his men perswaded to come off and retire himselfe from out the throng, answered, he would not now so neere his end, begin to turn his face from his enemie

2. In a way which suggests death.

   Her face suddenly became deadly white.

3. Extremely.
   • Orrery

     deadly weary

   • Arbuthnot

     so deadly cunning a man

• fail-deadly

• dead