Part of speech:
Capable of causing injury or death, especially by chemical means; poisonous.
Causing danger; ready to do harm or injury.
The definition of lethal is something very harmful or destructive, especially something that could cause death.
Harmful to the mind or morals; corrupting:
Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
Causing or leading to disease
Very destructive; most unfortunate; disastrous
Served without milk or cream:
Filled with, prompted by, or showing spite; malicious.
In a bad mood; irritable or cranky.
The definition of malignant is something evil or intending harm, a tumor that is spreading, or a disease that is invasive.
Capable of producing infection; infectious.
(Informal) Annoying; mischievous; bothersome
(Rare) Diseased or causing disease
Containing errors or alterations, especially ones that prevent proper understanding or use:
Having a harmful effect; injurious:
The definition of noisome is harmful, or bad smelling.
Psychologically unhealthy or unwholesome:
Like or constituting a pestilence; widespread and deadly
Merely negative; not helpful
Not achieving an adequate standard; poor:
Conducive to good health; healthful:
Promoting or conducive to good health or well-being; healthful
Contributing to health or growth; nutritious
Causing or able to cause harm; hurtful
Not causing or incapable of causing harm.
Of or caused by mephitis
Poisonous or poisoned
Characterized by anger or spite; malicious:
Malevolent is defined as someone or something that is harmful or evil.
Having the nature of or resulting from malice; deliberately harmful; spiteful:
(Slang) Hard to cope with; difficult or troublesome:
The definition of nasty is something that is very dirty, unpleasant or offensive.
Naughty in a playful way; mischievous
Capable of injuring or killing by poison
Characterized by intense ill will or spite
Find another word for poisonous. In this page you can discover 56 synonyms, antonyms, idiomatic expressions, and related words for poisonous, like: toxic, deadly, venomous, toxiferous, dangerous, lethal, noxious, virulent, vicious, morbific and fatal.