What term describes a person who shows little interest or concern?

The term that best describes a person who shows little interest or concern is "indifferent." Indifference indicates a lack of interest, enthusiasm, or concern about something. It is often characterized by a sense of apathy or disinterest.

In the context of interpersonal relationships or engagement with events, an indifferent person does not display emotional involvement or investment, which aligns perfectly with the definition of the term. This absence of concern often means that the individual does not prioritize the issues or situations at hand, reflecting a passive attitude.

Other options, while having their distinct meanings, do not encapsulate this specific lack of interest. For instance, "morose" refers to a gloomy or sullen disposition, "eccentric" describes an individual whose behavior deviates from societal norms in an unusual or quirky way, and "reticent" indicates someone who is reserved or reluctant to share their thoughts or feelings. None of these terms convey the direct meaning of indifference.