hazardous

[haz-er-duhs]
adjective
1.
full of risk; perilous; risky: a hazardous journey.
2.
dependent on chance.

Origin:
1570–80; hazard + -ous

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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
hazardous (ˈhæzədəs)
 
adj
1.  involving great risk
2.  depending on chance
 
'hazardously
 
adv
 
'hazardousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Watching television may indeed be hazardous to one's health.
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.
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