What term is used to describe someone likely to suffer from something regrettable or unwelcome?

The term that describes someone likely to suffer from something regrettable or unwelcome is "prone." This word suggests a tendency or inclination toward a specific condition or situation, particularly one that is negative or harmful. When someone is described as prone to certain issues, it indicates that they have a higher likelihood of experiencing those issues compared to others.

In contrast, "immunized" refers to protection against something, suggesting a lack of vulnerability rather than a tendency toward suffering. "Resilient" describes the ability to recover from challenges or setbacks, which does not align with the idea of being susceptible to unwelcome experiences. "Indifferent" implies a lack of interest or concern, and does not convey the notion of being likely to suffer from adverse situations. Thus, "prone" is the most accurate term in this context, as it specifically addresses the likelihood of facing negative outcomes.