hazardous
American Heritage Dictionary:
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haz·ard·ous
(hăz'ər-dəs) 
adj.
hazardousness haz'ard·ous·ness n.
adj.
- Marked by danger; perilous.
- Depending on chance; risky.
hazardousness haz'ard·ous·ness n.
Roget's Thesaurus:
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hazardous
adjective
- Involving possible risk, loss, or injury: adventurous, chancy, dangerous, jeopardous, parlous, perilous, risky, treacherous, unsafe, venturesome, venturous. Slang hairy. See safety/danger.
Antonyms by Answers.com:
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hazardous
adj
Definition: dangerous, unpredictable
Antonyms: certain, guarded, predictable, protected, safe, secure
Word Tutor:
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hazardous
IN BRIEF: Dangerous or risky.
Caution: These verses may be hazardous to your solemnity.
— Russell Baker
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Roget's Thesaurus
Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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