nonreactive

The word "nonreactive" is a modern English formation built from the Latin-derived negative prefix "non-" and the adjective "reactive." "Reactive" itself stems from the verb "react," which entered English in the 17th century from the Medieval Latin "react-," the past participle stem of "reagere," meaning "to do again, act in return." This Latin verb is a compound of "re-" (back, again) and "agere" (to do, drive). The core concept of "agere" can be traced back to the Proto-Indo-European root h₂eǵ- (to drive, lead). Therefore, the literal morphemic construction "not reacting" directly and logically yields the modern abstract meanings, describing either a chemically inert substance or a psychologically unresponsive state.

Structure: non (not) + reactive (reacting) - non: A prefix of Latin origin, meaning "not." It functions as a negative particle. - reactive: An adjective of English origin, derived from the verb "react." It functions as the base word describing the quality of reacting or responding.