full of or containing poison: poisonous air; a poisonous substance.
harmful; destructive: poisonous to animals; poisonous rumors.
deeply malicious; malevolent: poisonous efforts.

1565–75; poison + -ous

poisonously, adverb
poisonousness, noun
nonpoisonous, adjective
nonpoisonously, adverb
nonpoisonousness, noun
semipoisonous, adjective
semipoisonously, adverb
unpoisonous, adjective
unpoisonously, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
poisonous (ˈpɔɪzənəs)
1.  having the effects or qualities of a poison
2.  capable of killing or inflicting injury; venomous
3.  corruptive or malicious

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

poisonous poi·son·ous (poi'zə-nəs)
Relating to or caused by a poison.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If treatment is obtained soon enough, only a small percentage of those bitten
  by a poisonous snake die.
One of the poisonous aspects of being on the academic job market is feeling
  that one can't or shouldn't talk to people about it.
In the current climate, however, such provisions look more poisonous than ever.
Some species, including the popular flathead catfish, aren't poisonous at all.
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