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poisonous

poisonous

90 2.8
Containing a substance that can make you sick and can cause death if eaten, touched, or breathed
  • adjective
  • /ˈpɔɪzənəs/
translation icon : venenoso
  • Children should be taught not to touch poisonous plants, as they can lead to dangerous reactions.
  • a poisonous substance
  • poisonous plants
  • poisonous snakes

But food doesn't become poisonous just because it's misshapen.

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Examples

  • When I was in middle school, a poisonous spider bit my right hand.

  • And I gotta check the berries in the morning, make sure they're not poisonous.

  • As it happens, the atmosphere is highly poisonous, and if we get the float to the top, we're dead.

  • The terrain around that lake is poisonous.

  • It's a very poisonous and unstable compound.

  • As an additional hazard, the seeds are poisonous to many animals, including humans.

    Academic text (1995)
  • They have seven or eight of the world's most poisonous snakes live in Australia.

  • It makes sense to be afraid of poisonous insects or hungry tigers.

  • It's extremely poisonous.

  • They're great big things covered in nasty looking poisonous spines.

Synonyms

dangerous
vspoisonous
1.5

Likely to cause harm or injury

refers to causing illness or death from exposure, not general risk
deadly
vspoisonous
543 2.8

Able to cause death or serious harm

can cause illness as well as death rather than death only
toxic
vspoisonous
380 4.0

Containing poison that can cause harm or death

is about containing or producing such substances on contact or inhalation
lethal
vspoisonous
193 4.8

Able to cause death, for example by a weapon or poison

can also include cases that cause illness without immediate death
harmful
vspoisonous
161 2.6

Causing damage to people, animals or things

is specific to substances that can make people ill or kill them
noxious
vspoisonous
19 7.8

Harmful to health or strongly unpleasant to the senses

is specifically about producing harmful substances rather than general unpleasantness

Antonyms

1.0

Not likely to be harmed or in danger

231 1.0

Not able to hurt people or things

Compounds

A plant that can be deadly if you touch it or eat it

A rule that stops courts from using evidence found illegally

Something that can cause serious harm or death when swallowed, touched and breathed

A bite that puts poison into the body and can hurt or kill

A plant with violet flowers and bright red berries that is very poisonous if eaten

A mushroom with a round cap like an umbrella that is poisonous

How Poisonous

deadly
543 2.8
toxic
380 4.0
poisonous
90 2.8
harmless
231 1.0

Surface Forms

poisonous positive

Morphology

poisonous = poison (transparent) = poison + ous

Standard adjective formation from the noun 'poison' with '-ous', yielding the literal meaning 'containing or producing poison'.

Etymology

Poisonous comes from the old word poison, which once meant a 'drink' or 'potion' and is like the word potion. So, think of a harmful 'potion'—that's why poisonous describes things that can make you very sick or die.