didactic
Didactic (adjective) means Intended to teach something, especially a moral lesson, as well as to inform or entertain. Example: “Aesop's fables are frankly didactic, each ending in a stated moral.”
How to use didactic
Learner’s notesIn plain EnglishMeant to teach you a lesson — sometimes too obviously.
Formal; frequent in literary criticism, education and art writing.
Fill the gap
Can you complete this real example?
Aesop's fables are frankly _____, each ending in a stated moral.
Etymology
From Greek didaktikos 'skilled at teaching', from didaskein 'to teach'.