Synonyms of poisonous

poisonous

adjective

ˈpȯiz-nəs 

as in poisoned

containing or contaminated with a substance capable of injuring or killing a living thing

some evil person was leaving out poisonous meat for neighborhood dogs to eat

Synonyms & Similar Words

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

Antonyms & Near Antonyms

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

Examples of poisonous in a Sentence

Recent Examples on the Web

Common Types of Rashes and Conditions Treated Some of the common skin rashes and irritations that calamine lotion can help relieve include the following: Poison ivy/poison oak/poison sumac rash: These rashes are caused by oil from poisonous plants. —Megan Nunn, Pharmd, Verywell Health, 26 July 2024

The poisonous worms, which are native to Asia, have been reported in Alabama, California, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina and Texas, according to the New York Post. —Danielle Jennings, Peoplemag, 24 July 2024

Some blue-green blooms produce toxins called cyanobacteria that are poisonous to humans and dogs. —Julia Ries, Outside Online, 9 Aug. 2024

One sample had evidence of endotoxin, a poisonous substance found in E. coli and other bacteria that can cause infections in humans. —Lisa Rapaport, EverydayHealth.com, 7 Aug. 2024