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The water had been tainted with a deadly toxin.
noxious substances or toxic substances.
The pernicious influence of violent video games.
A venomous snake.
A venomous glance or a venomous attack.
A malicious smile or a malicious rumor or a malicious gossip.
David's health deteriorated rapidly.
Sorry to be nuisance, but could I use your phone?
chlorine is used in sewage treatment.
A lethal dose of heroin. A lethal weapon.