as in poisonous
containing or contaminated with a substance capable of injuring or killing a living thing
certain plants are toxic if eaten
Synonyms & Similar Words
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Antonyms & Near Antonyms
as in poison
a substance that by chemical action can kill or injure a living thing
tested for toxics in the water supply
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
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Recent Examples of toxic
Mikey O'Connell, HollywoodReporter, 4 June 2026
Without garbage collection, residents have begun burning waste in the streets, raising alarm among health officials over potentially toxic smoke.
—ABC News, 4 June 2026
Nushrat Rahman, Freep.com, 27 Dec. 2025
East Bay parks officials say hikers should beware of an unusually large number of toxic — and potentially deadly — mushrooms sprouting across the region.
—Jakob Rodgers, Mercury News, 10 Dec. 2025
See All Example Sentences for toxic
Adjective
The whole concept of toxic fandom confuses me because, outside of the anger and backwards thinking, because who cares about a movie franchise that much?
—Mikey O'Connell, HollywoodReporter, 4 June 2026
Without garbage collection, residents have begun burning waste in the streets, raising alarm among health officials over potentially toxic smoke.
—ABC News, 4 June 2026
Noun
The Michigan Legislature passed a law in 2008 meant to protect the public from harmful electronic waste toxics.
—Nushrat Rahman, Freep.com, 27 Dec. 2025
East Bay parks officials say hikers should beware of an unusually large number of toxic — and potentially deadly — mushrooms sprouting across the region.
—Jakob Rodgers, Mercury News, 10 Dec. 2025
See All Example Sentences for toxic
Recent Examples of Synonyms for toxic
Adjective
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Foxglove Foxglove features beautiful trumpet-like blossoms that are poisonous to cats.—
Amy DeYoung,
USA Today,
3 June 2026
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Some have thorns or spines, others have poisonous leaves or berries, and still others have…elaborate chemical defense alarm systems?—
Regina G. Barber,
NPR,
3 June 2026
Noun
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While keeping poison off the streets is paramount, rescuing those caught in the grip of addiction is the equally vital second half of Florida’s strategy.—
John Koufos,
Sun Sentinel,
2 June 2026
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In 2024, poison control centers started tracking 7-OH, a synthetic kratom derivative.—
Tara Molina,
CBS News,
1 June 2026
Noun
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But some researchers who were involved in the network say the cuts weakened relationships with experts abroad that had been fostered over years, undercutting research collaborations on dangerous diseases like Ebola.—
Theresa Gaffney,
STAT,
3 June 2026
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The company also flags baseline cardiac disease, abnormal ECG, arrhythmia, prior cervical vagotomy, abnormal cervical anatomy, brain tumor or aneurysm history, head trauma, syncope, seizures and nickel allergy as unevaluated risks.—
Samantha Agate,
Sacbee.com,
3 June 2026
Noun
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In cats, the toxin can cause tremors, diarrhea, vomiting, coughing, incoordination and seizures.—
Amy DeYoung,
USA Today,
3 June 2026
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Make sure to book a toxin-rinsing seaweed bath—outdoors and invigorating.—
Condé Nast,
Condé Nast Traveler,
2 June 2026
Cite this Entry
“Toxic.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/toxic. Accessed 8 Jun. 2026.
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