susceptibility

https://doi.org/10.1351/goldbook.15085
Condition of an organism or ecological system that makes it more vulnerable to a given exposure than the majority of the population or group of ecological systems to which it belongs.
Note: Susceptibility is inversely proportional to the magnitude of the exposure required to cause a toxic effect.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 953 [Terms] [Paper]