致命的な定義と意味 | Dictionary.com

DEADLY Definition & Meaning | Dictionary.com Synonyms deadly American [ ded -lee] / ˈdɛd li / adjective deadlier, deadliest causing or tending to cause death; fatal ; lethal . a deadly poison. aiming to kill or destroy; implacable . a deadly enemy. like death. a deadly pallor. excruciatingly boring. The dinner party was absolutely deadly. Synonyms: dreary , tedious , dull excessive ; inordinate . deadly haste. extremely accurate. Annie Oakley was a deadly shot. adverb in a manner resembling or suggesting death. deadly pale. excessively; completely . deadly dull. deadly British / ˈdɛdlɪ / adjective likely to cause death deadly poison deadly combat informal extremely boring "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 adverb like death in appearance or certainty deadly pale a deadly sleep "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 Related Words See fatal . Other Word Forms deadliness noun nondeadly adjective Etymology Origin of deadly First recorded before 900; Middle English deedli(ch), Old English dēadlīce; see dead , -ly Explanation Something that's deadly can kill you. Because a gun can end someone's life, it's a deadly weapon. If someone's diagnosed with a deadly disease, it's lethal — it's capable of ending the person's life. When you hear someone talk about police officers using " deadly force," they mean actions that intended to cause death, or understood to be capable of killing someone. You can also use the word to mean "extremely" or "very," as when you describe your math class as deadly boring. Keep Reading on Vocabulary.com Example Sentences Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com. It is a ritual that is at once deeply absurd and deadly serious. From The Wall Street Journal • Apr. 27, 2026 The "Banjska incident" is a prosaic label for one of the most dramatic, dangerous and deadly days Kosovo has seen since it unilaterally declared independence from Serbia in 2008. From BBC • Apr. 24, 2026 The lawyer told jurors Erickson knew nothing of the deadly incident until his then-girlfriend called him shortly after. From Los Angeles Times • Apr. 24, 2026 As commercial hives across the United States struggle to survive attacks from deadly parasites, a distinct hybrid bee found in this region is showing a surprising ability to endure. From Science Daily • Apr. 20, 2026 “Good. Just don’t ever tell your grandmothers, mom, or deadly aunties that it’s better than theirs.” From "Legendary Frybread Drive-In" by Cynthia Leitich Smith Related Words bloody carcinogenic cruel dangerous destructive fatal harmful lethal malignant mortal murderous noxious pernicious poisonous savage suicidal toxic violent virulent Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023 Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.