- full of or containing poison: poisonous air; a poisonous substance.
- harmful; destructive: poisonous to animals; poisonous rumors.
- deeply malicious; malevolent: poisonous efforts.
Origin of poisonous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for poisonous
Alcohol and sugar, even in moderate amounts, are not only sinful but poisonous.How Taryn Toomey’s ‘The Class’ Became New York’s Latest Fitness Craze
January 9, 2015
The stench of corruption is settling over world soccer like a poisonous fog, and players are paying the price.Is Soccer Great Lionel Messi Corrupt?
December 8, 2014
In Greek mythology, the Gorgon Medusa had the face of a woman and poisonous snakes for hair; her glance could turn men to stone.Russia’s Freest Website Now Lives in Latvia
November 29, 2014
Other organisms died off in large numbers because oxygen was poisonous to them.Why Did It Take So Long For Complex Life To Evolve On Earth? Blame Oxygen.
Matthew R. Francis
November 2, 2014
That said, this particularly retiring writer has received a poisonous gift from the Nobel committee.Nobel Prize Winner Modiano’s Magical Musical Prose About Paris
October 14, 2014
If there is a poisonous one among them, the onion will turn black.Directions for Cookery, in its Various Branches
It is some of the rivers flowing into it that are poisonous.Aino Folk-Tales
Basil Hall Chamberlain
Chemistry cannot tell us why some food is wholesome and other food is poisonous.Bunyan
James Anthony Froude
From this I quote the following, which is by no means the most erring and most poisonous of their shafts.The Book of Khalid
"They're just weeds and some of them might be poisonous," he declared.L'Assommoir
- having the effects or qualities of a poison
- capable of killing or inflicting injury; venomous
- corruptive or malicious
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
Word Origin and History for poisonous
Online Etymology Dictionary, © 2010 Douglas Harper
- 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.