Synonyms for obligatory in English

Antonyms

• optional
• voluntary
• unnecessary
• discretionary
• witting
• nonessential
• free
• elective
• facultative
• non-binding
• non-compulsory
• non binding
• non-statutory
• soft
• non-committal
• nonbinding
• permissive
• uncontrolled
• unessential
• optionally
• unrequired
• dispensable
• electoral
• discretional
• pre-election
• pre-electoral
• ...