Didactic

Something which is intended to instruct. Sometimes, to be morally instructive. "Didaktikos" is a Greek word that means "apt at teaching." It comes from "didaskein," meaning "to teach." Something didactic does just that: teaches or instructs. Didactic conveyed that neutral meaning when it was first borrowed in the 17th century, and still does; a didactic piece of work is one that is meant to be instructive as well as artistic. Genre painting and sculpture — narrative and often allegorical — is apt to be didactic, especially when its aim is to teach a moral lesson. Didactic now often has negative connotations, because something didactic can be over-burdened with instruction to the point of being dull. Or it might be pompously instructive or moralistic. (Artlex.com)

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