All optional synonyms

adjective optional

• elective — Related to or working by means of election.
• noncompulsory — Not compulsory.
• voluntary — done, made, brought about, undertaken, etc., of one's own accord or by free choice: a voluntary contribution.
• discretionary — subject or left to one's own discretion.
• possible — that may or can be, exist, happen, be done, be used, etc.: a disease with no possible cure.
• uncompelled — to force or drive, especially to a course of action: His disregard of the rules compels us to dismiss him.
• free — enjoying personal rights or liberty, as a person who is not in slavery: a land of free people.
• alternative — If one thing is an alternative to another, the first can be found, used, or done instead of the second.
• arbitrary — If you describe an action, rule, or decision as arbitrary, you think that it is not based on any principle, plan, or system. It often seems unfair because of this.
• discretional — discretionary.
• extra — Added to an existing or usual amount or number.
• facultative — conferring a faculty, privilege, permission, or the power of doing or not doing something: a facultative enactment.
• no strings attached — without conditions
• nonobligatory — Not obligatory; not required; optional.
• open — not closed or barred at the time, as a doorway by a door, a window by a sash, or a gateway by a gate: to leave the windows open at night.
• unforced — enforced or compulsory: forced labor.
• unrestricted — confined; limited.
• volitional — the act of willing, choosing, or resolving; exercise of willing: She left of her own volition.