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hazardous

[haz-er-duh s] /ˈhæz ər dəs/
adjective
1.
full of risk; perilous; risky:
a hazardous journey.
2.
dependent on chance.
Origin
1570-1580
1570-80; hazard + -ous
Related forms
hazardously, adverb
hazardousness, noun
nonhazardous, adjective
nonhazardously, adverb
nonhazardousness, noun
ultrahazardous, adjective
unhazardous, adjective
unhazardously, adverb
Synonyms
1. dangerous, unsafe. 2. chancy, uncertain, risky, speculative.
Antonyms
1. safe, secure. 2. sure, certain, reliable.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un hazardous

hazardous

/ˈhæzədəs/
adjective
1.
involving great risk
2.
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 un hazardous

hazardous

adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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