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taint(v)
The water had been tainted with a deadly toxin.
noxious(adj)
noxious substances or toxic substances.
pernicious(adj)
The pernicious influence of violent video games.
venomous1 (adj)
A venomous snake.
venomous2 (adj)
A venomous glance or a venomous attack.
malicious(adj)
A malicious smile or a malicious rumor or a malicious gossip.
deteriorate(v)
David's health deteriorated rapidly.
nuisance(n)
Sorry to be nuisance, but could I use your phone?
sewage(n)
chlorine is used in sewage treatment.
lethal(adj)
A lethal dose of heroin. A lethal weapon.