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Synonyms for optional

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modified

discretionary, elective, nonobligatory, noncompulsory, free, unrestricted, arbitrary, unforced, volitional, not required, according to one's will, with no strings attached*, take it or leave it*; see also voluntary.

Antonyms necessary*, compulsory, enforced.

See optional in Webster's New World Roget's A-Z Thesaurus II

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