What is the opposite of mandatory?

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

Adjective
Opposite of required or commanded by authority
“All donations are voluntary and tax-deductible.”
Adjective
Opposite of necessary or very important
“The college-distance 3-pointer has always seemed an illogical and unnecessary appendage to a wonderful game.”
Adjective
Opposite of bound to happen
Adjective
Opposite of in accordance with regulations
Adjective
Opposite of certain to happen
“Failure is avoidable if you take the necessary precautions.”
Adjective
Opposite of occurring as natural consequence
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