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poisonous

/ˈpɔɪzənəs/ adjective B1
  1. Containing sufficient poison to be dangerous to touch or ingest. · While highly poisonous to dogs, this substance is completely harmless if ingested by humans.
  2. Of an animal such as a snake or spider, or parts of its body: producing a toxin intended for defensive or offensive use which is usually injected into an enemy or prey by biting or stinging; hence, of a bite or sting: injecting poison. · Poisonous snakes should only be handled by experienced professionals.
  3. Negative, harmful. (figuratively)
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From the library

Soon they rolled the Lion out of the poppy bed to the green fields, where he could breathe the sweet, fresh air again, instead of the poisonous scent of the flowers.
The Wonderful Wizard of Oz, p. 55 · B2
Of course I have other reasons for thinking so—dozens of exiguous threads which lead vaguely up towards the centre of the web where the poisonous, motionless creature is lurking.
The Valley of Fear, p. 15 · C1
They are less poisonous than one would expect.
Sherlock Holmes: The Bruce-Partington Plans, p. 28 · B2
“No, it’s this poisonous atmosphere.”
The Hound of the Baskervilles, p. 30 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.