What is the opposite of compulsory?

Need antonyms for compulsory? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of required by law or a rule
“Whilst it is mandatory for passengers to wear seat belts in this country, it is optional in other parts of the world.”
Adjective
Opposite of necessary or very important
“The game contains many inessential, though fun, side missions for you to complete in between the main storyline.”
Adjective
Opposite of bound to happen
Adjective
Opposite of certain to happen
“Failure is avoidable if you take the necessary precautions.”
Adjective
Opposite of in accordance with regulations
Adjective
Opposite of convincing or effective
Adjective
Opposite of occurring as natural consequence
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