危険な 定義と意味 | Dictionary.com

DANGEROUS Definition & Meaning | Dictionary.com Synonyms dangerous American [ deyn -jer- uh s, deynj -r uh s] / ˈdeɪn dʒər əs, ˈdeɪndʒ rəs / adjective full of danger or risk; causing danger ; perilous; risky; hazardous; unsafe. able or likely to cause physical injury. a dangerous criminal. dangerous British / ˈdeɪndʒərəs / adjective causing danger; perilous "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 dangerous Idioms see little knowledge is a dangerous thing; live dangerously . Other Word Forms dangerously adverb dangerousness noun nondangerous adjective nondangerously adverb nondangerousness noun quasi-dangerous adjective quasi-dangerously adverb semidangerous adjective semidangerously adverb semidangerousness noun undangerous adjective undangerously adverb Etymology Origin of dangerous First recorded in 1175–1225; Middle English da(u)ngerous “domineering, fraught with danger,” from Old French dangereus “threatening, difficult,” equivalent to dangier ( see danger ) + -eus -ous Explanation Use the word dangerous to describe anything that can potentially cause serious harm, like a snarling pit bull or an icy, treacherous road. The earliest meaning of the word dangerous was "difficult or arrogant." When Geoffrey Chaucer wrote "The Canterbury Tales" in the 1300s, he used dangerous to mean "hard to please." Gradually the meaning changed, so that by the late fifteenth century, dangerous meant "liable to cause hurt" or "risky." Just as popular were two other danger -related words that we don't use anymore today: dangersome and dangerful , which at the time could be used interchangeably with dangerous . Keep Reading on Vocabulary.com Vocabulary lists containing dangerous Words Every Pirate Should Know Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide! "Volcano!" Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use! "Brothers in Hope" Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time! 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. Oleshky is imprisoned by both geography and war; cut off by a river and wrecked bridges to the north – and dangerous or impassable roads inland. From BBC • May 6, 2026 On Monday it accused Iran of firing missiles and drones including a strike on an oil port in the emirate of Fujairah which is located outside the Strait of Hormuz, calling it a "dangerous escalation". From BBC • May 5, 2026 Mr. Arnold took to social media last week to promote Dr. Prasad’s 2015 book “Ending Medical Reversal,” which argues that many medical advances are dangerous and useless. From The Wall Street Journal • May 5, 2026 “It’s too dangerous to put firefighters in the tunnel.” From Los Angeles Times • May 5, 2026 The most dangerous game, and one that could save Great Britain and even the world. From "The Bletchley Riddle" by Ruta Sepetys and Steve Sheinkin Related Words alarming bad critical deadly fatal nasty perilous precarious risky serious terrible threatening treacherous ugly unhealthy unsafe unstable 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.