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Optional
Synonyms for
optional
alternative
arbitrary
discretional
discretionary
dispensable
elective
extra
facultative
free
inessential
no strings attached
non-essential
noncompulsory
nonmandatory
nonobligatory
not required
open
uncalled-for
unessential
unforced
unnecessary
unrestricted
up to the individual
volitional
voluntary
witting
Opposites of
optional
There are 26 synonyms for optional