TOXIC Synonyms: 70 Similar and Opposite Words

toxic 1 of 2

adjective

ˈtäk-sik

Definition of toxic

as in poisonous

containing or contaminated with a substance capable of injuring or killing a living thing certain plants are toxic if eaten

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Antonyms & Near Antonyms

toxic

2 of 2

noun

as in poison

a substance that by chemical action can kill or injure a living thing tested for toxics in the water supply

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of toxic

Adjective

The same flower toxic to a lamb was also a medicine for depression. — Emily Ruskovich, The Atlantic, 7 July 2026 Oreana is drawn to toxic people, not just toxic men; that includes the toxic people surrounding her. — Brian Davids, HollywoodReporter, 7 July 2026

Noun

Manufacturers should be diligently working to clean up their supply chains and manufacturing practices to ensure their products are free of PFAS and other toxics. — Sarah Todd, STAT, 1 May 2026 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 See All Example Sentences for toxic

Recent Examples of Synonyms for toxic

Adjective

All of this played out against an increasingly poisonous political environment.

— Eric Berger, ArsTechnica, 3 July 2026
Sago palm, oleander, foxglove, azaleas and lily of the valley are all common and all poisonous.

— Ryan Brennan, Miami Herald, 2 July 2026

Definition of poisonous

Noun

In Orange County, its vector control district reported its first disease-carrying mosquitoes in Newport Beach on June 2.

— Karen Garcia, Los Angeles Times, 8 July 2026
The disease does not generally spread from person to person, but infections can occur if the bacteria get into a building's water supply, including in shower heads, sink faucets, hot water tanks, heaters, cooling towers and other plumbing systems.

— Mary Kekatos, ABC News, 7 July 2026

Definition of disease

Noun

Alcohol Drinking alcohol often or in large amounts produces toxins, causes oxidative stress, and harms your gut and liver, triggering inflammation.

— Brandi Jones, Verywell Health, 6 July 2026
Washing blueberries removes dirt and toxins that may cling to the fruit during handling and transporting from farm to store.

— Martha Stewart, Martha Stewart, 3 July 2026

Definition of toxin

Browse Nearby Words

tows

toxic

toxicant

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“Toxic.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/toxic. Accessed 11 Jul. 2026.

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Synonyms of toxic

adjective

noun

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