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

Low employee morale often grows from ongoing negative interactions and toxic workplace cultures. — Kate Wieczorek, Forbes.com, 1 July 2026 Potatoes naturally contain glycoalkaloids, but sprouting and green coloring indicate an increase in these compounds and a higher risk of toxic effects like vomiting and stomach upset. — Aly Walansky, Southern Living, 29 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 Asparagus releases a chemical toxic to root knot nematodes, a microscopic round worm that creates multiple disease and growth problems in tomatoes, eggplant, potatoes and peppers. — Barbara Gillette, The Spruce, 3 May 2026 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

The shipment includes emergency health kits for urgent medical care, including supplies for safe births, newborn care, disease prevention and treatment, according to the United Nations.

— Michael Sinkewicz, FOXNews.com, 1 July 2026
The rabies vaccine, if administered immediately after exposure, is nearly 100% successful at preventing the disease, according to the World Health Organization.

— Kelli Arseneau, USA Today, 1 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 7 Jul. 2026.

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Synonyms of toxic

adjective

noun

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