Part of speech:
Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
Harmful to the mind or morals; corrupting:
Harmful or destructive:
(Computing) Causing a sudden end to the running of a program.
Causing or able to cause harm; hurtful
The definition of lethal is something very harmful or destructive, especially something that could cause death.
Malignant; spiteful; malicious
Of or caused by mephitis
Poisonous or poisoned
Capable of injuring or killing by poison
Find another word for toxic. In this page you can discover 16 synonyms, antonyms, idiomatic expressions, and related words for toxic, like: virulent, noxious, deadly, poisonous, fatal, harmful, lethal, venomous, harmless, nonpoisonous and nontoxic.