Synonym: deadly, destructive, harmful, malignant, noxious, toxic, venomous. Similar words: poison, monotonously, monotonous, sonorous, gluttonous, cacophonous, poise, porpoise. Meaning: ['pɔɪznəs] 
adj. 1. having the qualities or effects of a poison 2. not safe to eat 3. marked by deep ill will; deliberately harmful.
adj. 1. having the qualities or effects of a poison 2. not safe to eat 3. marked by deep ill will; deliberately harmful. 
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1, This medicine is poisonous if taken in large quantities.
2, Some mushrooms are good to eat; some are poisonous.
3, The leaves of certain trees are poisonous to cattle.
4, Unfortunately some poisonous mushrooms look like edible mushrooms.
5, I had a frightening encounter with a poisonous snake.
6, He was bitten by a poisonous snake.
7, Some mushrooms are extremely poisonous.
8, Ways must be found to prevent the poisonous gases from polluting the air.
9, These chemicals can emanate certain poisonous gases.
10, The chemicals can be poisonous if ingested.
11, He gave her a poisonous look.
12, Are these berries edible,[http://sentencedict.com/poisonous.html] or are they poisonous?
13, He was given an emetic after eating poisonous berries.
14, This gas is highly poisonous.
15, These berries are edible, but those are poisonous.
16, Some mushrooms look innocuous but are in fact poisonous.
17, Carbon monoxide is a colourless, odourless, poisonous gas.
18, The weather was positively poisonous.
19, The berries are poisonous to birds.
20, He ate some poisonous mushrooms, with fatal consequences.
21, The leaves of yew trees are poisonous to cattle.
22, The lid prevents the escape of poisonous gases.
23, Poisonous smoke had got into the water supply.
24, He said some poisonous things to me.
25, There are hundreds of poisonous spiders and snakes.
26, Fungus can be poisonous.
27, Poisonous vapours burst out of the factory during the accident, causing several hundred deaths.
28, The tail exhaust pipe of the motor vehicle emitted poisonous smoke.
29, In remote regions, the air is pure and the crops are free of poisonous insecticides.
30, There's absolutely no regulation of cigarettes to make sure that they don't include poisonous substances.
More similar words: poison, monotonously, monotonous, sonorous, gluttonous, cacophonous, poise, porpoise, noisome, prison, orison, honour, prisoner, benison, liaison, iron out, jettison, garrison, imprison, pronoun, comparison, imprisoned, caparison, dishonour, pronounce, by comparison, pronounced, james madison, imprisonment, mispronounce.