toxic

adjective

1. 1

   Having a chemical nature that is harmful to health or lethal if consumed or otherwise entering into the body in sufficient quantities.

   “Tobacco smoke contains many toxic substances.”

2. 2

   Appearing grossly unwell; characterised by serious, potentially life-threatening compromise in the respiratory, circulatory or other body systems.

   “The child appeared toxic on arrival at the hospital.”

3. 3

   Severely negative or harmful.

   “a toxic environment that promoted bullying”

4. 4

   (of a person) Hateful or strongly antipathetic.

   “It is not good to be around toxic people.”