deadly

deadly
I
(New American Roget's College Thesaurus)
adj. lethal, fatal; malignant; informal, dull. See killing, disease, weariness.
II
(Roget's IV) modif.
1. [Causing death]
Syn. fatal, lethal, murderous, mortal, deathly, poisonous, toxic, homicidal, bloody, noxious, destructive, venomous, deleterious, baleful, malignant, terminal, virulent, injurious, pestilential, pestiferous, death-dealing, carcinogenic, suicidal, bloodthirsty, cannibalistic, life-threatening, killing, baneful, pernicious, harmful, violent, inevitable; see also dangerous 2 , destructive 2 .
Ant. healthful*, reviving, beneficial.
2. [Very tiresome]
Syn. boring, tedious, tiresome; see dull 4 .
Syn.- deadly is applied to a thing that can and probably (but not inevitably) will cause death [ a deadly poison ] ; fatal implies the inevitability or actual occurrence of death or disaster [ a fatal disease, a fatal mistake ] ; mortal implies that death has occurred or is about to occur and is applied to the immediate cause of death [ he has received a mortal blow ] ; lethal is applied to that which in its nature or purpose is a cause of death [ a lethal weapon, a lethal dose ]
III
(Roget's 3 Superthesaurus) a.
fatal, lethal, deathly, mortal, malignant, toxic, killing, dangerous, virulent, death-dealing, pernicious, baneful.
ANT.: harmless, benign, innocuous
IV
(Roget's Thesaurus II) adjective 1. Causing or tending to cause death: deathly, fatal, lethal, mortal, vital. See LIVE. 2. Gruesomely suggestive of ghosts or death: cadaverous, deathlike, deathly, ghastly, ghostlike, ghostly, spectral. See LIVE. 3. Extremely destructive or harmful: baneful, malignant, noxious, pernicious, pestilent, pestilential, virulent. See HELP.

English dictionary for students. 2013.

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  • deadly — adj 1 Deadly, mortal, fatal, lethal mean causing or causative of death. Deadly may imply an extremely high degree of probability rather than a certainty of death; the term therefore applies to something with the capacity of or a marked… …   New Dictionary of Synonyms

  • deadly — [ded′lē] adj. deadlier, deadliest [ME dedlich < OE deadlic: see DEAD & LY1] 1. causing death or likely to cause death [a deadly poison] 2. to the death; mortal or implacable [deadly combat, deadly enemies] …   English World dictionary

  • deadly — dead·ly adj dead·li·er, est: likely to cause or capable of causing death; also: dangerous (2) ◇ Deadly and dangerous are sometimes used interchangeably, esp. in connection with weapons or instruments. Merriam Webster’s Dictionary of Law. Merriam… …   Law dictionary

  • Deadly — may refer to: Deadly (novel series), a children s book by Morris Gleitzman and Paul Jennings Deadly (TV series), an Australian children s television cartoon series Karla, a 2006 American motion picture originally titled Deadly Alan Deadly… …   Wikipedia

  • deadly — dead ly, a. 1. Capable of causing death; mortal; fatal; destructive; certain or likely to cause death; as, a deadly blow or wound. [1913 Webster] 2. Aiming or willing to destroy; implacable; desperately hostile; flagitious; as, deadly enemies.… …   The Collaborative International Dictionary of English

  • deadly — dead ly, adv. 1. In a manner resembling, or as if produced by, death; deathly. Deadly pale. Shak. [1913 Webster] 2. In a manner to occasion death; mortally. [1913 Webster] The groanings of a deadly wounded man. Ezek. xxx. 24. [1913 Webster] 3. In …   The Collaborative International Dictionary of English

  • deadly — [adj1] causing end of life baleful, baneful, bloodthirsty, bloody, cannibalistic, carcinogenic, cruel, dangerous, death dealing, deathly, deleterious, destroying, destructive, fatal, grim, harmful, homicidal, injurious, internecine, killing,… …   New thesaurus

  • deadly — ► ADJECTIVE (deadlier, deadliest) 1) causing or able to cause death. 2) (of a voice, glance, etc.) filled with hate. 3) extremely accurate or effective. 4) informal extremely boring. ► ADVERB 1) …   English terms dictionary

  • deadly — O.E. deadlic mortal, subject to death, also causing death; see DEAD (Cf. dead) + LY (Cf. ly) (2). Meaning having the capacity to kill is from late 14c. (O.E. words for this included deaðbærlic, deaðberende) …   Etymology dictionary

  • deadly — I UK [ˈdedlɪ] / US adjective Word forms deadly : adjective deadly comparative deadlier superlative deadliest * 1) able or likely to kill people This is a potentially deadly disease. deadly to: Too many water changes can prove deadly to these… …   English dictionary

  • deadly — [[t]de̱dli[/t]] deadlier, deadliest 1) ADJ GRADED If something is deadly, it is likely or able to cause someone s death, or has already caused someone s death. He was acquitted on charges of assault with a deadly weapon. ...a deadly disease… …   English dictionary

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