all:
optional.
essential, required:
unrequired,
nonessential,
free,
voluntary,
optional,
unnecessary.
noun:
original,
chosen,
unknown,
novel,
absorbing,
riveting,
intriguing,
engaging,
unheard-of,
gripping,
inconsequential,
enlivening,
unprecedented,
unfamiliar,
stimulating,
strange,
engrossing,
unwanted,
uncommon,
unusual,
unhackneyed,
insignificant,
galvanizing,
atypical,
unneeded,
invigorating,
fresh,
energizing,
unaccustomed,
unimportant,
exciting,
extraordinary,
interesting,
dispensable,
nonessential,
new,
animating.
n.:
discretional.
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