All noncompulsory antonyms

adjective noncompulsory

• compulsory — If something is compulsory, you must do it or accept it, because it is the law or because someone in a position of authority says you must.
• forced — strained, unnatural, or affected: a forced smile.
• required — to have need of; need: He requires medical care.
• necessary — being essential, indispensable, or requisite: a necessary part of the motor.
• needed — necessary, required, or wanted (usually used in combination): a much-needed vacation.
• valuable — having considerable monetary worth; costing or bringing a high price: a valuable painting; a valuable crop.
• worthwhile — such as to repay one's time, attention, interest, work, trouble, etc.: a worthwhile book.
• indispensable — absolutely necessary, essential, or requisite: an indispensable member of the staff.
• careful — If you are careful, you give serious attention to what you are doing, in order to avoid harm, damage, or mistakes. If you are careful to do something, you make sure that you do it.
• designed — made or done intentionally; intended; planned.
• essential — Absolutely necessary; extremely important.
• planned — arranged, organized, or done in accordance with a plan: a planned attack.
• important — of much or great significance or consequence: an important event in world history.