Synonyms for compulsory in English

Antonyms

• optional
• voluntary
• non-compulsory
• unforced
• discretionary
• elective
• unnecessary
• free
• gratuitous
• non-binding
• non binding
• non-statutory
• non-committal
• nonbinding
• permissive
• uncontrolled
• optionally
• facultative
• unessential
• uncoerced
• costless
• provided for free
• pro bono
• pre-electoral
• pre-election
• one for free
• on the house
• offered for free
• offer free
• nonobligatory
• nonmandatory
• free of any charge
• discretional
• costs nothing
• rent-free
• no-obligation
• ...