preachy

marked by or given to preaching moral values the students rolled their eyes as their principal launched into another preachy lecture about behavior at the prom Synonyms didactic, homiletic (or homiletical), moralistic, moralizing, sermonic, sententiousRelated Words dogmatic (also dogmatical), prescriptive; admonishing, admonitory, cautionary; advisory, enlightening, instructive; holier-than-thou, self-righteous