instructive (adj.)

• admonitory
• advisory
• authoritative
• autodidactic
• binding
• canonical
• cautionary
• coeducational
• commanding
• communicative
• compelling
• consultative
• consultatory
• cultural
• dictated
• didactic
• directive
• disciplinary
• edifying
• educational
• educative
• enlightening
• exhortative
• exhortatory
• formulary
• helpful
• homiletic
• hortative
• hortatory
• illuminating
• imperative
• informational
• informative
• initiatory
• introductory
• mandatory
• monitory
• moralistic
• moralizing
• official
• peremptory
• preachy
• prescribed
• prescriptive
• propaedeutic
• regulation
• revealing
• sententious
• standard
• statutory
• warning