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[haz-er-duh s] /ˈhæz ər dəs/
full of risk; perilous; risky:
a hazardous journey.
dependent on chance.
Origin of hazardous
1570-80; hazard + -ous
Related forms
hazardously, adverb
hazardousness, noun
nonhazardous, adjective
nonhazardously, adverb
nonhazardousness, noun
ultrahazardous, adjective
unhazardous, adjective
unhazardously, adverb
1. dangerous, unsafe. 2. chancy, uncertain, risky, speculative.
1. safe, secure. 2. sure, certain, reliable. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hazardous
  • Watching television may indeed be hazardous to one's health.
  • Yet the number of children laboring in hazardous and exploitative conditions around the world continues to grow.
  • Common household hazardous wastes include motor oil, pesticides, batteries and paints.
  • Meteorites contain no hazardous materials, which may be harmful to humans.
  • The frightening-looking mushroom cloud emanating from the cooling tower appeared more hazardous than it actually was.
  • Old commercial and military vessels are good for scrap metal but they carry a full cargo of hazardous materials.
  • But it is quite possible that publicity can be hazardous to a scientific career.
  • Aiming to beat hazardous turbulence behind planes.
  • The discovery that tungsten, by itself in the environment, is also hazardous may escalate things to a new level.
  • The afterlife is hazardous territory for scholarly conjecture.
British Dictionary definitions for hazardous


involving great risk
depending on chance
Derived Forms
hazardously, adverb
hazardousness, noun
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
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Word Origin and History for hazardous

1580s, "venturesome;" 1610s, "perilous," from hazard (n.) + -ous or from Middle French hasardeux (16c.).

Online Etymology Dictionary, © 2010 Douglas Harper
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