toxicity
n. uncountablen. the quality of being poisonous or harmful to living things. It can also describe a situation or relationship that is very negative and damaging to your mental health.
n. the degree to which a substance can damage an organism, or the quality of being poisonous. In social contexts, refers to harmful, manipulative, or destructive behavior within a group or relationship.
The scientists are testing the toxicity of the new chemical.
The manager resigned because the toxicity of the office environment was affecting his health.
Environmental regulations aim to limit the toxicity of industrial runoff to protect local aquatic ecosystems from long-term damage.
From toxic + -ity.
Uncountable in most contexts; can be used with 'of' to specify the source of the harm.