toxic

adjective4

1. •
   able to make a person very ill or kill them if it gets into the body

   • Tobacco smoke contains many toxic substances.
2. •
   (figurative) Severely negative or harmful.
3. •
   (figurative) Of a person, hateful or strongly antipathetic.

   • It is not good to be around toxic people.
4. •
   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.