What term refers to a relatively permanent inclination to react in a particular way?

The term that best captures the idea of a relatively permanent inclination to react in a particular way is "disposition." When discussing human behavior, a disposition refers to an inherent quality or natural tendency to behave or respond in a specific manner across various situations. It implies a consistent pattern in an individual's behavior that is not easily changed, indicating that the inclination is deeply rooted in their character or personality.

"Disposition" encompasses a broader context of enduring characteristics, making it more suitable than the other options. For instance, while "bent" conveys a similar notion of inclination, it often has a more informal connotation and might imply a preference or skill rather than a stable trait. "Tendency" suggests a likelihood or probability of acting in a certain way but does not necessarily denote permanence. "Attitude," on the other hand, often relates to one's feelings or opinions toward specific subjects or situations, rather than a general inclination to react. Thus, "disposition" is the most accurate choice for describing a lasting tendency to respond in a certain manner.