Synonyms of toxic

toxic 1 of 2

adjective

ˈtäk-sik 

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

• poisonous
• poisoned
• poison
• venomous
• harmful
• infectious
• infective
• pathogenic
• malignant
• injurious
• deleterious
• virulent
• envenomed
• lethal
• contagious
• baneful
• noxious
• pestilential
• unhealthful
• hurtful
• fatal
• unhealthy
• nocuous
• deadly
• unwholesome
• pestilent
• calamitous
• murderous
• fell

Antonyms & Near Antonyms

• nontoxic
• beneficial
• healthy
• helpful
• healthful
• remedial
• wholesome
• harmless
• curative
• nonpoisonous
• benign
• palliative
• salutary
• salubrious
• innocuous
• nonvenomous
• inoffensive
• nonfatal
• nonlethal

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

Synonyms & Similar Words

• poison
• disease
• toxin
• venom
• pesticide
• virus
• toxicant
• bane
• contagion
• cancer
• herbicide
• insecticide
• fungicide
• germicide
• microbicide

Antonyms & Near Antonyms

• antidote
• antivenin
• cure
• antivenom
• panacea
• elixir
• mithridate
• cure-all

Example Sentences

Recent Examples of toxic

Adjective

If something goes wrong, these facilities have the potential to release massive amounts of toxic chemicals. — Josh Boswell, CBS News, 5 Aug. 2026

District officials argued in TCEQ filings that nutrients in the wastewater could promote the growth of toxic blue green algae. — Emily Holshouser, Fort Worth Star-Telegram, 5 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