致命的な定義と意味 - メリアム・ウェブスター

DEADLY Definition & Meaning - Merriam-Webster Est. 1828 Dictionary Definition adjective adverb adjective 2 adjective adverb Synonyms Synonym Chooser Example Sentences Word History Phrases Containing Rhymes Entries Near Cite this Entry Citation Kids Definition Kids Medical Definition Medical Legal Definition Legal More from M-W Show more Show more Citation Kids Medical Legal More from M-W Save Word To save this word, you'll need to log in. Log In deadly 1 of 2 adjective dead·​ly ˈded-lē deadlier ; deadliest Synonyms of deadly Simple Definition A Simple Definition is available from our Learner's Dictionary to help you understand the meaning faster. 1 : likely to cause or capable of producing death deadly poison 2 a : aiming to kill or destroy : implacable a deadly enemy b : highly effective a deadly exposé c : unerring a deadly marksman d : marked by determination or extreme seriousness 3 a : tending to deprive of force or vitality a deadly habit b : suggestive of death especially in dullness or lack of animation deadly bores a deadly conversation 4 : very great : extreme deadliness noun deadly 2 of 2 adverb 1 archaic : in a manner to cause death : mortally 2 : suggesting death 3 : extremely deadly serious Synonyms of deadly Relevance Adjective lethal fatal Adverb extremely incredibly very terribly highly damned damn too badly so severely super really seriously desperately jolly intensely far most that See All Synonyms & Antonyms in Thesaurus Choose the Right Synonym for deadly deadly , mortal , fatal , lethal mean causing or capable of causing death. deadly applies to an established or very likely cause of death. a deadly disease mortal implies that death has occurred or is inevitable. a mortal wound fatal stresses the inevitability of what has in fact resulted in death or destruction. fatal consequences lethal applies to something that is bound to cause death or exists for the destruction of life. lethal gas Examples of deadly in a Sentence Adjective the world's most deadly snake a more deadly form of the disease They launched a deadly attack. Officers are allowed to use deadly force if necessary. She shoots with deadly accuracy. a basketball player with deadly aim A deadly silence followed his question. The two gang leaders are deadly enemies. He spoke with deadly seriousness. Adverb I'm deadly serious about making an offer on the house. See More Recent Examples on the Web Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback . Adjective As Operation Midway Blitz began to wind down in the Chicago area last November, federal immigration agents launched a new and deadly surge of enforcement in Minneapolis in December and earlier this year. — Rick Pearson, Chicago Tribune , 27 Apr. 2026 Dehydration can be dangerous and downright deadly , and that's even more true for a senior. — Aly Walansky, Travel + Leisure , 27 Apr. 2026 Adverb In Langbein’s comic, but also deadly serious, imagination, this is no mere metaphor. — Los Angeles Times , 22 Apr. 2026 This was a black one with blotches faintly outlined in pale yellow, a beautiful but deadly looking animal. — Dr. C. E. Kuschel, Outdoor Life , 9 Apr. 2026 See All Example Sentences for deadly Word History First Known Use Adjective before the 12th century, in the meaning defined at sense 1 Adverb before the 12th century, in the meaning defined at sense 1 Time Traveler The first known use of deadly was before the 12th century See more words from the same century Phrases Containing deadly deadly nightshade deadly sin Rhymes for deadly medley See All Rhymes for deadly Browse Nearby Words dead loss deadly deadly agaric See all Nearby Words Cite this Entry Style MLA Chicago APA Merriam-Webster “Deadly.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/deadly. Accessed 30 Apr. 2026. Copy Citation Kids Definition deadly 1 of 2 adjective dead·​ly ˈded-lē deadlier ; deadliest 1 : likely to cause or capable of causing death a deadly weapon 2 a : aiming to kill or destroy a deadly enemy b : very accurate : unerring a deadly marksman 3 : very great : extreme a deadly bore deadliness noun deadly 2 of 2 adverb 1 : suggesting death deadly pale 2 : to a very great degree deadly dull Medical Definition deadly adjective dead·​ly ˈded-lē deadlier ; deadliest : likely to cause or capable of causing death a deadly disease a deadly poison a deadly instrument deadliness -nəs noun Legal Definition deadly adjective dead·​ly deadlier ; deadliest : likely to cause or capable of causing death also : dangerous sense 2 Note: Deadly and dangerous are sometimes used interchangeably, especially in connection with weapons or instruments. More from Merriam-Webster on deadly Nglish: Translation of deadly for Spanish Speakers Last Updated: 28 Apr 2026 - Updated example sentences Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Merriam-Webster unabridged More from Merriam-Webster Word of the Day interlocutor See Definitions and Examples » Get Word of the Day daily email! Popular in Grammar & Usage See More More Commonly Mispronounced Words 5 Verbal Slip Ups and Language Mistakes Is that lie 'bald-faced' or 'bold-faced'? The Difference Between 'i.e.' and 'e.g.' Why is '-ed' sometimes pronounced at the end of a word? See More Popular in Wordplay See More The Longest Long Words List 9 Other Words for Beautiful Was 'nervous Nellie' a Real Person? 12 Lovely and Unusual Words for the Natural World Why do we 'bury the lede?' See More Popular See More More Commonly Mispronounced Words The Longest Long Words List 9 Other Words for Beautiful See More Games & Quizzes See All Quordle Can you solve 4 words at once? Play Blossom Pick the best words! 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