Which term is opposite of being actively involved or concerned?

The term that signifies the opposite of being actively involved or concerned is "indifferent." Indifference describes a lack of interest, concern, or engagement with a particular issue, situation, or person. When someone is indifferent, they do not actively participate or show care, which contrasts with being involved or concerned about a matter.

The other terms do not convey this sense of disengagement. "Inured" refers to being accustomed to something, typically something unpleasant, which implies an adaptation rather than a lack of concern. "Frugality" relates to being economical or thrifty, often concerning financial matters, but does not indicate a disinterest in involvement. Similarly, "poverty" describes a socioeconomic condition and does not directly address the level of engagement or concern one might have. Thus, "indifferent" is the most accurate term to capture the opposite of active involvement or concern.