compulsatory

adjective compulsatory

• binding — A binding promise, agreement, or decision must be obeyed or carried out.
• de rigueur — If you say that a possession or habit is de rigueur, you mean that it is fashionable and therefore necessary for anyone who wants to avoid being considered unfashionable.
• forced — strained, unnatural, or affected: a forced smile.
• imperative — imperative language
• mandatory — authoritatively ordered; obligatory; compulsory: It is mandatory that all students take two years of math.