preceptive

/prɪˈsɛptɪv/
adjective
  1. Giving or containing instructions or rules; didactic.
    • The book is full of preceptive advice on how to be a good leader.
    • The manual is highly preceptive, telling you exactly what to do in each situation.
    • His preceptive tone made the lecture feel like a list of commands.
Antonyms