susceptibility

n. vulnerability; emotional sensitivity; inability to resist a particular external influence, impressionability

In physics, the susceptibility of a material or substance describes its response to an applied field. There are two kinds of susceptibilities:Magnetic susceptibilityElectric susceptibilityThese two susceptibilities are particular examples of a linear response function; sometimes the terms susceptibility and linear response function are used interchangeably.In medicine:Susceptible individual
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Susceptibility the state of being susceptible. Refers usually to infectious disease but may be to physical factors such as wetting or to [more]Susceptibility - Community and Resources

Noun
1. the state of being susceptible; easily affected
(synonym) susceptibleness
(antonym) unsusceptibility, immunity
(hypernym) condition, status
(hyponym) liability
(attribute) susceptible

(n.)
The state or quality of being susceptible; the capability of receiving impressions, or of being affected.
  

(n.)
Specifically, capacity for deep feeling or emotional excitement; sensibility, in its broadest acceptation; impressibility; sensitiveness.