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

Ultimately, vinegar provides an affordable and non-toxic alternative that performs just as well. — Mary Cornetta, Better Homes & Gardens, 1 Sep. 2026 After eventually being transferred to a nearby hospital, the resident was diagnosed with sepsis and toxic epidermal necrolysis, a rare and life-threatening skin condition which causes a person’s skin to blister. — Matan Josephy, Idaho Statesman, 31 Aug. 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

But the point was just that Nick’s character is emulating Sheridan’s poisonous corrupted values, and the internet is a vehicle for that relationship.

— Brian Davids, HollywoodReporter, 27 Aug. 2026
For this reason, these poisonous mushrooms are more commonly confused with other types of edible mushrooms like chicken of the woods and chanterelles (more on these in a minute).

— Katie Hill, Outdoor Life, 6 Aug. 2026

Definition of poisonous

Noun

New findings by a team of researchers from the US and Australia have complicated an ongoing debate over whether a total joint arthroplasty may increase the risk of Alzheimer’s disease.

— Mike McRae August 31, New Atlas, 1 Sep. 2026
As the disease progresses, people can develop a stiff neck, seizures and coma.

— Anthony Thompson, USA Today, 1 Sep. 2026

Definition of disease

Noun

The California State Senate passed a bill Thursday to regulate potential toxins in diapers — a product moms, dads and caregivers may use up to 8,000 times before a child is potty-trained.

— Sandee LaMotte, CNN Money, 28 Aug. 2026
Spring honey carries the highest toxin concentrations of the year.

— Prayan Pokharel, The Conversation, 27 Aug. 2026

Definition of toxin

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tows

toxic

toxicant

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“Toxic.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/toxic. Accessed 5 Sep. 2026.

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Synonyms of toxic

adjective

noun

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